AUCTORES
Globalize your Research
Review Article | DOI: https://doi.org/10.31579/2694-0248/044
Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do, 17180, Korea.
*Corresponding Author: Dongchan Lee, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do, 17180, Korea.
Citation: Dongchan Lee. (2023), Characteristics of the Stress-Strain Curve of Auxetic Structures for the Monitoring and Analysis of Human Body Bio-Signal, J Clinical Orthopaedics and Trauma Care, 5(5); DOI: 10.31579/2694-0248/044
Copyright: © 2023, Dongchan Lee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 21 October 2023 | Accepted: 15 November 2023 | Published: 29 November 2023
Keywords: auxetic structure; cross chiral structure; variable stiffness; musculoskeletal assistive structure
The tendons that connect muscle to the bone under human physical activity show that they get fatter and thinner when stretched and contracted, and exhibit unusual auxetic behaviors. A tendon is a tough, high-tensile-strength band of dense fibrous connective tissue. In transmitting the mechanical forces of muscle contraction to the skeletal system, the tendon behaviors in abrupt movements such as jumping are essential for positioning as well as energy absorption. But they are also prone to damage when injuries occur. For decreasing the damage caused by the load-transmitted burden of tendons, the auxetic musculoskeletal assistive structure is proposed in the visco-elastic form with a fitting ability to simultaneously contract and expand in two perpendicular directions when the body motion occurs. To design a macro-auxetic structure with elastic flexibilities in the musculoskeletal assistive structure, it is important to develop an auxetic unit cell with the variable stiffness. Auxetic structures play key roles in assisting human motion. Periodic cellular structures used in the auxetic structures are first considered in the field of lightweight construction due to their high specific stiffness, damping, and energy-absorbing properties. In the periodic unit cell, the structural performance may be influenced by the strut angle. The collapse of the CCS (Cross Chiral Structure) structure occurs at around 20 degrees of the strut angle. Under 10 degrees, the structure possesses a linear behavior. When a more obvious inflection range exists, clearer changes in strength and flexibility can be observed and the external force absorption is expected to be excellent. Over 30 degrees, it is like a solid block from the beginning of external force and does not show the structural characteristics of CCS.
Tendons in the skeletal movement of human body mainly composed of collagen fibers are viscoelastic structures that permit force transfer from muscle to bone. They are essential for positioning as well as energy storage for abrupt movements, such as jumping. Nevertheless, some severe injuries, such as Achilles tendinopathies commonly occurring in athletes, cause irreparable damage to tendons. To protect tendons from such damage, understanding their viscoelastic behavior is very important. Tendons display a stretched and a crimped structure with and without a load, respectively. In detail, stretching a tendon causes bundles of fibers, called fascicles, to slide against each other, and it eventually returns to their original shape when an external force is released. Stretching beyond this range, called a yield stress, results in permanent deformation [1, 2].
Auxetic musculoskeletal assistive structures have been proposed as a solution to minimize the load-transmitted burden to a tendon. The structures worn on a human body can simultaneously contract and expand in two perpendicular directions due to their negative Poisson’s ratio as the body motion occurs. This permits the structures to conform to the contours of the body with the best comfortable fit. To fabricate an auxetic structure with elastic flexibilities in macro-size for a musculoskeletal assistive device, a few attempts to study an auxetic unit cell with the adjustability of stiffness have been made. For example, periodic cellular patterns for the auxetic unit cell are considered in the field of lightweight construction due to their high specific stiffness, damping, and energy-absorbing properties [3]. Their critical design, materials, and processing methods for the optimal patch to target specific pathology in biomechanics are outlined in Chansoria et al. [4]. An organic review on various biological systems with sophisticated architectures for impact resistance and energy absorption is provided. Furthermore, their dynamic behaviors related to designs and underlying mechanisms are discussed. For instance, results demonstrate that representative bio-inspired structures exhibiting beyond 60 J/g for specific energy absorptions can be used for excellent impact protection structures [5]. Such mechanical properties can be controlled by appropriately choosing the pattern of the underlying unit cell with a negative Poisson’s ratio [6~8]. Even several 3D auxetic cellular structures have been developed by adapting simple 2D structures into 3D re-entrant hexagon cellular structures [9-11].
In this paper, auxetic structures with various combinations of materials and components are investigated for the variable stiffness and comfortability of potential applications in body protection and support. An auxetic material is a class of meta-materials that exhibit a negative Poisson’s Ratio. It has been known for over a hundred years but has only gained attention in recent decades. It can be a single molecule, but more often consists of an engineered material with a particular structure on the macroscopic level. Auxetic structures can be created by using flexure hinge-like or spring-like features that change their shapes (thickness, width, height) when a force is applied to them. If an axial tensile force is given, the hinge-like structures extend, causing lateral expansion. If a compressive force is applied, the hinge-like structures fold even further, causing lateral contraction. Thus, man-made auxetic materials may be used to manufacture adaptive clothes with variable stiffness. Adaptive clothes need auxetic material patches with variable stiffness, which contain the auxetic cell shown in Figure 1. In order to achieve bending behavior with a structure of variable stiffness, the intermediate layer must be constructed in the form of a meta-structure. If a constant voltage is applied depending on the amount of load voltage, due to the form of a meta-structure consisting of cells of the same structure as a spring, it is compressed into electromagnetic properties that occur at the electrode layer, and according to the fluctuation of the constant voltage changes in the cells of the meta-structure occurs resulting in spring-like variable stiffness, thus bending deformations will appear above and below a certain voltage. Finite element analyses and experiments are conducted to evaluate the performance and effectiveness of the auxetic structures. In the future, the possibility of making pad structures thinner and lighter will be examined through an optimization process using geometric dimensions. The development of this kind of structure makes it possible for soft robots to adjust their stiffness levels in real time during the operation. Soft robots can perform sophisticated and precise movements for tasks requiring fine manipulation while keeping the wearers safe. These advancements will broaden the scope of soft robotics applications and contribute to the development of more capable and user-friendly robotic systems. This is particularly beneficial in applications involving human-robot interaction or tasks related to collaborative manufacturing, assistive devices, and healthcare robotics.
Figure 1: Auxetic musculoskeletal assistive structure with variable stiffness; (a) Concept of Soft garment; (b) 3D Auxetic structure with adjustable stiffness and unit cell; (c) Electro-Active deformation of 3D Auxetic structure for motion intention.; (d) Muscular activation support system for daily life
Various designs were generated and investigated based on criteria such as performance, comfort, and manufacturability. Auxetic materials are a class of meta-materials on the cell geometry which exhibit a negative Poisson’s Ratio. The structural characteristics of auxetic material depend on the cell geometry [12-15].
Figure 2: 3D models of cross chiral structure. (a) Unit cell of cross chiral structure; (b) 3 x 3 x 1 lattice of cross chiral structure
Figure 3: Schematics for CCS (Cross Chiral Structure) unit; (a) Strut Configurations of CCS; (b) Bending deformation of strut
Figure. 2 shows a unit cell structure and 3x3x1 lattice structure, which composed of three-unit cells in row and column, respectively, for the investigation of CCS. The cross-chiral auxetic structure has a symmetrical geometry, as shown in Figure. 3. After rotation in the out-of-plane direction, this serial and parallel configurations of 2D structure can be readily patterned into a 3D structure, CCS, as shown in Figure 3. The CCS has a symmetrical geometry and can readily be patterned into a 3D structure with rotation in or out of a plane. Figure. 3 shows a structural schematic model in a plane view. The representative unit of CCS is determined by four primary geometrical parameters: length of the strut L, the tilt angle of the strut , strut's cross-section in-plane thickness t and width w, as shown in Figure 3. In this study, it is supposed that the cross-sectional shape of struts in CCS is square, so it can be assumed that t=w.
Three configurations are designed for the following compression experiments in the z-direction. For each design, the cubic unit cells are arranged periodically to form 3D lattice samples with 3 × 3 × 1 unit cells. The tilt angle of the strut varies from 10 to 30 with the size of the unit cell constant. The models described above are chosen because the geometry of CCS can be varied systematically using a single parameter, , which facilitates the analysis of the deformation mechanisms of the auxetic materials. Meanwhile, the size of each model needs to meet the requirements for fabrication and experiments. The force analysis of the representative unit at the top or bottom layers is shown in Figure 3. The end-point A is the free end, which is only contacted with the hard striker. But, due to the symmetry of the structure, constraints at the end-points B, C, and D are much stronger because of the rigid connection with other units. As a result, the main deformation occurs in strut-OA while slight deformation is observed in other struts. Therefore, the deformation of the struts-OB, OC, and OD can be neglected, and strut-OA is simplified to a cantilever beam where the origin O is fixed in this model.
The bending moment and axial stress at origin O can be expressed as,
The model regarding large deflection takes nonlinear dimensional change into consideration and it is expected to be more accurate in calculating the value of stress in a typical position. Before reaching the plastic yield stress, the strut is subjected to large deflection upon loading, which could affect the stress distribution, as shown in Figure 3-b. The model regarding large deflection takes nonlinear dimensional change into consideration and it is expected to be more accurate in calculating the value of stress in a typical position. Additionally, the perfectly plastic beam is also used and several assumptions are adopted for theoretical analysis: the large deformation is analyzed in the elastic section of the material and the process will not be considered that the failure occurs at the surface first and then extends across the entire section when the strut starts to yield.
In Figure 3-(b), a curvilinear coordinate S, with origin O, is used to define the position of the bending member. Neglecting the change in length of OA due to axial compression. According to the Euler-Bernoulli theorem for beam bending, the differential equation of the deflection curve is,
where I is second moment inertia of the cross-section and 
, 
is the bending angle of a general point along a deformed member between the tangent of the shape of the inclined member and the loading direction, Δ
is the maximum lateral displacement before the strut fails, s and are the distances of a general point along the curvilinear coordinate and along the horizontal direction from origin O, respectively. Considering the relationship between the O-xy and O-s coordinate systems, the following geometrical relationships could be readily obtained,
Differentiating Eq. (2) with respect to s and combining Eq. (3), we obtain,
Using Eq. (4), the following equation can be yield,
Eq. (5) may be integrated once to yield,
where the boundary conditions is,
and then
It can be seen form Figure 3-(b) that 
is positive, solving for ds gives,
Performing one more integration of Eq. (9) yields,
From eq. (10), the force F can be expressed as,
For these bending-dominated cell structures, the yield stress is obtained by setting the moment equal to the collapse moment in the critical struts. If the fully plastic behavior for a perfectly plastic beam under combined bending moment and extensional stress can be estimated, the loading conditions may be predicted for the bending angle of a general point along a deformed member between the tangent of the shape of the inclined member and the loading direction.
Using Eqs. (3) and (9), the horizontal projected distance x() of a general point (x, y) on the strut-OA along the x-axis and the vertical projected distance y(
) of the general point (x, y) along the y-axis can be estimated. From eq. (12) on the effective area of unit cell strut(A), the basic dimensions of geometries may be estimated below the fracture strength of struts of unit cell of cross chiral structure.
Auxetic cells made of polyurethane in Table 1 exhibit a negative Poisson’s Ratio and their auxetic characteristics depend on the cell’s geometric parameters. For the auxetic structure with variable stiffness, a 3D printer (FORMIGA P110, EOS) was used to build specimens using a material called PEBA2301. The dimension size of auxetic blocks is 30 (mm) x 30 (mm) x 10 (mm) shown in Figure. 4-(a) which have the different tilting angle of unit cell for the experiments and the investigation of their structural characteristics. The fabricated specimens are doubled in width and height on the fixed thickness. Compression strength is the maximum stress that a material can withstand while being compressed before failing or breaking as shown in Figure. 4-(b). It is an important mechanical property of auxetic materials. A universal testing machine (QM100SE, QMSYS) was used to measure the mechanical properties of the 3D structural specimens. The set-up for the experiment was arranged based on a standard manual that specifies the sample preparation, fixturing, gauge length, analysis, etc. The specimen was placed in the machine between the grips and an extensometer, which records the change in gauge length during the test. If an extensometer is not installed, the machine itself can record the displacement between its crossheads on which the specimen is held. Once the machine starts, it begins to apply an increasing load on the specimen. The payload can be applied up to 40kgf as shown in Figure. 4-(c).
| Characteristics | Unit | Polyurathane (Semiflex) |
| Density | kg/m3 | 1200 |
| Young’s Modulus | MPa | 15.30-25.82 |
| Shear Modulus | MPa | 3.27-8.38 |
| Poisson’s Ratio | - | 0.48 |
| Tensile Strength | MPa | 23 |
Table 1: Material properties of auxetic cell
Figure 4: Test specimens and machine for the structural properties of an auxetic unit cell; (a) Auxetic structure specimens; (b) Compression test using universal tensile machine; (c) Force-displacement curve of specimen 1, 2, and 3
Figure. 4 shows various auxetic structure specimens with the amounts of porosities which is not filled with the unit cells. Sample 1, 2 and 3 are CCS (cross-chiral structure) structure with the top and bottom plates that is to protect the warping behaviors of auxetic cells. Each sample has some porosities, respectively: Sample 1: 75% porosity ratio, Sample 2: 50% porosity ratio, Sample 3: 25% porosity ratio. Under compression tests, the mechanical characteristics of samples are different to the porosity ratio of CCH structure. As the CCH structure becomes denser, the behavior of CCH structure becomes stiffener. In this paper, sample 2 is selected as the valid prototype for the soft auxetic structure with variable stiffness [5-8]. Figure. 5 shows the stress-strain curve for sample 2 with respect to the various angular variables (θ) of the CCS bridge and Figure. 6 shows the displacement contour with respect to the angular variables. As the lower angle is applied, more resistance capacity and faster inflection are observed. The collapse of the CCS structure occurs at around 20 degrees of the strut angle θ. Under 10 degrees, the structure possesses a linear behavior. When a more obvious inflection range exists, clearer changes in strength and flexibility can be observed and the external force absorption is expected to be excellent. Over 30 degrees, it is similar to a solid block from the beginning of external force and does not show the structural characteristics of CCS.
Figure 5: Stress-strain curve of CCS for different strut angle θ (a: 10 degrees, b: 20 degrees, c:. 30 degrees, d: 40 degrees) UTM results are given by solid lines; symbols denote yield points; the chain line represent our reference value, 5.
Figure 6: Deformation contour of CCS unit for different strut angle θ; (a) 10 degrees; (b) 20 degrees; (c) 30 degrees; (d) 40 degrees
Using the auxetic sample 2 of 3x3x1 CCS structure, the stress-strain curve, and strain coefficient are shown in Figure 7 and 8 for the compression ratio (compressibility) percentages (a. 0%, b. 20%, c. 30%, d. 40%). Those figures show the average values obtained from five experiments for each sample, in which the solid line shows the experimental value of the universal testing machine and the symbol depicts the inflection point on the structural change or analogical yielding point (5 kgf/cm2). Except for the analogical yielding phenomenon of the specimen with 0% compressibility, others have more yielding points in the test range. This analogical yielding point increases as the compressibility increases. The mechanical characteristics of CCS gradually disappear at the 40% compression rate, which means a physical property becomes similar to the solid structure as shown in Figure 7.
Figure 7: The stress-strain to CCS structure; (a) non-compression; (b) 20%-compression; (c) 30%-compression; (d) 40%-compression. UTM results is given by solid lines; symbols denote yield points; the chain line represents our reference value, 5.
Figure 8: Strain coefficient as a function of compressibility: 20% compression (top orange curve), 30% compression (middle brown curve), and 40% compression (bottom single point curve).
Figure. 8 shows the strain coefficient on the compressibility, which is the slope of the stress-strain curve. The strain coefficient means the resistance capacity to the external compression force and material strength. The lower-triangle and upper-triangle respectively shows the slop of the pre- or post- inflection points and the chain-dot line is the difference of two values. The initial physical property of auxetic pad depends on lower-triangle. The more upper-triangle, the more resistance force to the external compression force. This buckling mode of auxetic pad changes in 20% compression rate and depends on the CCH structure. It is estimated that the maximum influence will be 22% compression rate. The Poisson’s ratio and stiffness curves had a high nonlinearity for unit cell dimensions. This nonlinearity is due to the different stiffness of each cell and the surface contacts of the struts. As the unit cell is gradually compressed, the cell element stays rigid due to higher stiffness and only the vertical strut begins to collapse causing surface contacts among themselves. Eventually, the auxetic hollow structure becomes a solid block and starts behaving like a normal structure. While the pad is pulled, the zig-zag-shaped vertical strut will be straightened and eventually begin stretched while the rhombus-shaped cell components still experience much less deformation. It means that the transition of the structure from the auxetic to non-auxetic normal structure occurs when the surface contact begins when it is compressed and when the vertical strut is fully straightened under tensile load.
The CCS shows a strong ability to regulate its mechanical properties over a quite wide range by tuning geometrical parameters or relative density. In addition, the CCS could exhibit stable auxetic behavior under large deformation, making it easy to predict its deformation even under large deformation. It is found the CCS with 30 degrees possesses the highest energy absorption capacity. In the case of quasi-static (or low-velocity) mode and medium-velocity mode, the energy absorption efficiency of sample 2 is stable at about 50%, which is higher than most cellular materials reported before. In particular, sample 2 shows the highest absorption efficiency under stable quasi-static mode.
The strut thickness has an influence on the variable behavior of auxetic cells. In order to have the soft variable stiffness in the auxetic cell under the given payload, the resistance force for changing behavior should be maintained under the control of strut angle and thickness. To be used for the macro-auxetic cell of a variable stiffness suit, the geometric factor is recommended to be in the negative slope, which means that the structure becomes hard beyond a certain strut angle and flexible below it. Thus, the valid strut angle, thickness, and length should be taken into account under the given payload. This can be seen as a result of the characteristics of the soft auxetic structure unit design applied with different materials. At the beginning of the strength test, a graph with a lower elastic coefficient is drawn, and a higher elastic coefficient is drawn from the moment the force is transferred to the auxetic material. This allows us to observe differences between the propensity of compression strength and elasticity coefficients. The elastic factor range was specified from the moment the force was transferred to the material under each condition, and the compressive strength was measured as the maximum strength value in the 30% strain.
“This research was supported by the Alchemist Project (No. 1415187415, No. 20025750) funded by the Technology Innovation Program funded by the Korea Planning & Evaluation Institute of Industrial Technology (KEIT) and the Ministry of Trade, Industry, & Energy (MOTIE)”.
Clearly Auctoresonline and particularly Psychology and Mental Health Care Journal is dedicated to improving health care services for individuals and populations. The editorial boards' ability to efficiently recognize and share the global importance of health literacy with a variety of stakeholders. Auctoresonline publishing platform can be used to facilitate of optimal client-based services and should be added to health care professionals' repertoire of evidence-based health care resources.
Journal of Clinical Cardiology and Cardiovascular Intervention The submission and review process was adequate. However I think that the publication total value should have been enlightened in early fases. Thank you for all.
Journal of Women Health Care and Issues By the present mail, I want to say thank to you and tour colleagues for facilitating my published article. Specially thank you for the peer review process, support from the editorial office. I appreciate positively the quality of your journal.
Journal of Clinical Research and Reports I would be very delighted to submit my testimonial regarding the reviewer board and the editorial office. The reviewer board were accurate and helpful regarding any modifications for my manuscript. And the editorial office were very helpful and supportive in contacting and monitoring with any update and offering help. It was my pleasure to contribute with your promising Journal and I am looking forward for more collaboration.
We would like to thank the Journal of Thoracic Disease and Cardiothoracic Surgery because of the services they provided us for our articles. The peer-review process was done in a very excellent time manner, and the opinions of the reviewers helped us to improve our manuscript further. The editorial office had an outstanding correspondence with us and guided us in many ways. During a hard time of the pandemic that is affecting every one of us tremendously, the editorial office helped us make everything easier for publishing scientific work. Hope for a more scientific relationship with your Journal.
The peer-review process which consisted high quality queries on the paper. I did answer six reviewers’ questions and comments before the paper was accepted. The support from the editorial office is excellent.
Journal of Neuroscience and Neurological Surgery. I had the experience of publishing a research article recently. The whole process was simple from submission to publication. The reviewers made specific and valuable recommendations and corrections that improved the quality of my publication. I strongly recommend this Journal.
Dr. Katarzyna Byczkowska My testimonial covering: "The peer review process is quick and effective. The support from the editorial office is very professional and friendly. Quality of the Clinical Cardiology and Cardiovascular Interventions is scientific and publishes ground-breaking research on cardiology that is useful for other professionals in the field.
Thank you most sincerely, with regard to the support you have given in relation to the reviewing process and the processing of my article entitled "Large Cell Neuroendocrine Carcinoma of The Prostate Gland: A Review and Update" for publication in your esteemed Journal, Journal of Cancer Research and Cellular Therapeutics". The editorial team has been very supportive.
Testimony of Journal of Clinical Otorhinolaryngology: work with your Reviews has been a educational and constructive experience. The editorial office were very helpful and supportive. It was a pleasure to contribute to your Journal.
Dr. Bernard Terkimbi Utoo, I am happy to publish my scientific work in Journal of Women Health Care and Issues (JWHCI). The manuscript submission was seamless and peer review process was top notch. I was amazed that 4 reviewers worked on the manuscript which made it a highly technical, standard and excellent quality paper. I appreciate the format and consideration for the APC as well as the speed of publication. It is my pleasure to continue with this scientific relationship with the esteem JWHCI.
This is an acknowledgment for peer reviewers, editorial board of Journal of Clinical Research and Reports. They show a lot of consideration for us as publishers for our research article “Evaluation of the different factors associated with side effects of COVID-19 vaccination on medical students, Mutah university, Al-Karak, Jordan”, in a very professional and easy way. This journal is one of outstanding medical journal.
Dear Hao Jiang, to Journal of Nutrition and Food Processing We greatly appreciate the efficient, professional and rapid processing of our paper by your team. If there is anything else we should do, please do not hesitate to let us know. On behalf of my co-authors, we would like to express our great appreciation to editor and reviewers.
As an author who has recently published in the journal "Brain and Neurological Disorders". I am delighted to provide a testimonial on the peer review process, editorial office support, and the overall quality of the journal. The peer review process at Brain and Neurological Disorders is rigorous and meticulous, ensuring that only high-quality, evidence-based research is published. The reviewers are experts in their fields, and their comments and suggestions were constructive and helped improve the quality of my manuscript. The review process was timely and efficient, with clear communication from the editorial office at each stage. The support from the editorial office was exceptional throughout the entire process. The editorial staff was responsive, professional, and always willing to help. They provided valuable guidance on formatting, structure, and ethical considerations, making the submission process seamless. Moreover, they kept me informed about the status of my manuscript and provided timely updates, which made the process less stressful. The journal Brain and Neurological Disorders is of the highest quality, with a strong focus on publishing cutting-edge research in the field of neurology. The articles published in this journal are well-researched, rigorously peer-reviewed, and written by experts in the field. The journal maintains high standards, ensuring that readers are provided with the most up-to-date and reliable information on brain and neurological disorders. In conclusion, I had a wonderful experience publishing in Brain and Neurological Disorders. The peer review process was thorough, the editorial office provided exceptional support, and the journal's quality is second to none. I would highly recommend this journal to any researcher working in the field of neurology and brain disorders.
Dear Agrippa Hilda, Journal of Neuroscience and Neurological Surgery, Editorial Coordinator, I trust this message finds you well. I want to extend my appreciation for considering my article for publication in your esteemed journal. I am pleased to provide a testimonial regarding the peer review process and the support received from your editorial office. The peer review process for my paper was carried out in a highly professional and thorough manner. The feedback and comments provided by the authors were constructive and very useful in improving the quality of the manuscript. This rigorous assessment process undoubtedly contributes to the high standards maintained by your journal.
International Journal of Clinical Case Reports and Reviews. I strongly recommend to consider submitting your work to this high-quality journal. The support and availability of the Editorial staff is outstanding and the review process was both efficient and rigorous.
Thank you very much for publishing my Research Article titled “Comparing Treatment Outcome Of Allergic Rhinitis Patients After Using Fluticasone Nasal Spray And Nasal Douching" in the Journal of Clinical Otorhinolaryngology. As Medical Professionals we are immensely benefited from study of various informative Articles and Papers published in this high quality Journal. I look forward to enriching my knowledge by regular study of the Journal and contribute my future work in the field of ENT through the Journal for use by the medical fraternity. The support from the Editorial office was excellent and very prompt. I also welcome the comments received from the readers of my Research Article.
Dear Erica Kelsey, Editorial Coordinator of Cancer Research and Cellular Therapeutics Our team is very satisfied with the processing of our paper by your journal. That was fast, efficient, rigorous, but without unnecessary complications. We appreciated the very short time between the submission of the paper and its publication on line on your site.
I am very glad to say that the peer review process is very successful and fast and support from the Editorial Office. Therefore, I would like to continue our scientific relationship for a long time. And I especially thank you for your kindly attention towards my article. Have a good day!
"We recently published an article entitled “Influence of beta-Cyclodextrins upon the Degradation of Carbofuran Derivatives under Alkaline Conditions" in the Journal of “Pesticides and Biofertilizers” to show that the cyclodextrins protect the carbamates increasing their half-life time in the presence of basic conditions This will be very helpful to understand carbofuran behaviour in the analytical, agro-environmental and food areas. We greatly appreciated the interaction with the editor and the editorial team; we were particularly well accompanied during the course of the revision process, since all various steps towards publication were short and without delay".
I would like to express my gratitude towards you process of article review and submission. I found this to be very fair and expedient. Your follow up has been excellent. I have many publications in national and international journal and your process has been one of the best so far. Keep up the great work.
We are grateful for this opportunity to provide a glowing recommendation to the Journal of Psychiatry and Psychotherapy. We found that the editorial team were very supportive, helpful, kept us abreast of timelines and over all very professional in nature. The peer review process was rigorous, efficient and constructive that really enhanced our article submission. The experience with this journal remains one of our best ever and we look forward to providing future submissions in the near future.
I am very pleased to serve as EBM of the journal, I hope many years of my experience in stem cells can help the journal from one way or another. As we know, stem cells hold great potential for regenerative medicine, which are mostly used to promote the repair response of diseased, dysfunctional or injured tissue using stem cells or their derivatives. I think Stem Cell Research and Therapeutics International is a great platform to publish and share the understanding towards the biology and translational or clinical application of stem cells.
I would like to give my testimony in the support I have got by the peer review process and to support the editorial office where they were of asset to support young author like me to be encouraged to publish their work in your respected journal and globalize and share knowledge across the globe. I really give my great gratitude to your journal and the peer review including the editorial office.
I am delighted to publish our manuscript entitled "A Perspective on Cocaine Induced Stroke - Its Mechanisms and Management" in the Journal of Neuroscience and Neurological Surgery. The peer review process, support from the editorial office, and quality of the journal are excellent. The manuscripts published are of high quality and of excellent scientific value. I recommend this journal very much to colleagues.
Dr.Tania Muñoz, My experience as researcher and author of a review article in The Journal Clinical Cardiology and Interventions has been very enriching and stimulating. The editorial team is excellent, performs its work with absolute responsibility and delivery. They are proactive, dynamic and receptive to all proposals. Supporting at all times the vast universe of authors who choose them as an option for publication. The team of review specialists, members of the editorial board, are brilliant professionals, with remarkable performance in medical research and scientific methodology. Together they form a frontline team that consolidates the JCCI as a magnificent option for the publication and review of high-level medical articles and broad collective interest. I am honored to be able to share my review article and open to receive all your comments.
“The peer review process of JPMHC is quick and effective. Authors are benefited by good and professional reviewers with huge experience in the field of psychology and mental health. The support from the editorial office is very professional. People to contact to are friendly and happy to help and assist any query authors might have. Quality of the Journal is scientific and publishes ground-breaking research on mental health that is useful for other professionals in the field”.
Dear editorial department: On behalf of our team, I hereby certify the reliability and superiority of the International Journal of Clinical Case Reports and Reviews in the peer review process, editorial support, and journal quality. Firstly, the peer review process of the International Journal of Clinical Case Reports and Reviews is rigorous, fair, transparent, fast, and of high quality. The editorial department invites experts from relevant fields as anonymous reviewers to review all submitted manuscripts. These experts have rich academic backgrounds and experience, and can accurately evaluate the academic quality, originality, and suitability of manuscripts. The editorial department is committed to ensuring the rigor of the peer review process, while also making every effort to ensure a fast review cycle to meet the needs of authors and the academic community. Secondly, the editorial team of the International Journal of Clinical Case Reports and Reviews is composed of a group of senior scholars and professionals with rich experience and professional knowledge in related fields. The editorial department is committed to assisting authors in improving their manuscripts, ensuring their academic accuracy, clarity, and completeness. Editors actively collaborate with authors, providing useful suggestions and feedback to promote the improvement and development of the manuscript. We believe that the support of the editorial department is one of the key factors in ensuring the quality of the journal. Finally, the International Journal of Clinical Case Reports and Reviews is renowned for its high- quality articles and strict academic standards. The editorial department is committed to publishing innovative and academically valuable research results to promote the development and progress of related fields. The International Journal of Clinical Case Reports and Reviews is reasonably priced and ensures excellent service and quality ratio, allowing authors to obtain high-level academic publishing opportunities in an affordable manner. I hereby solemnly declare that the International Journal of Clinical Case Reports and Reviews has a high level of credibility and superiority in terms of peer review process, editorial support, reasonable fees, and journal quality. Sincerely, Rui Tao.
Clinical Cardiology and Cardiovascular Interventions I testity the covering of the peer review process, support from the editorial office, and quality of the journal.
Clinical Cardiology and Cardiovascular Interventions, we deeply appreciate the interest shown in our work and its publication. It has been a true pleasure to collaborate with you. The peer review process, as well as the support provided by the editorial office, have been exceptional, and the quality of the journal is very high, which was a determining factor in our decision to publish with you.
The peer reviewers process is quick and effective, the supports from editorial office is excellent, the quality of journal is high. I would like to collabroate with Internatioanl journal of Clinical Case Reports and Reviews journal clinically in the future time.
Clinical Cardiology and Cardiovascular Interventions, I would like to express my sincerest gratitude for the trust placed in our team for the publication in your journal. It has been a true pleasure to collaborate with you on this project. I am pleased to inform you that both the peer review process and the attention from the editorial coordination have been excellent. Your team has worked with dedication and professionalism to ensure that your publication meets the highest standards of quality. We are confident that this collaboration will result in mutual success, and we are eager to see the fruits of this shared effort.
Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, I hope this message finds you well. I want to express my utmost gratitude for your excellent work and for the dedication and speed in the publication process of my article titled "Navigating Innovation: Qualitative Insights on Using Technology for Health Education in Acute Coronary Syndrome Patients." I am very satisfied with the peer review process, the support from the editorial office, and the quality of the journal. I hope we can maintain our scientific relationship in the long term.
Dear Monica Gissare, - Editorial Coordinator of Nutrition and Food Processing. ¨My testimony with you is truly professional, with a positive response regarding the follow-up of the article and its review, you took into account my qualities and the importance of the topic¨.
Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, The review process for the article “The Handling of Anti-aggregants and Anticoagulants in the Oncologic Heart Patient Submitted to Surgery” was extremely rigorous and detailed. From the initial submission to the final acceptance, the editorial team at the “Journal of Clinical Cardiology and Cardiovascular Interventions” demonstrated a high level of professionalism and dedication. The reviewers provided constructive and detailed feedback, which was essential for improving the quality of our work. Communication was always clear and efficient, ensuring that all our questions were promptly addressed. The quality of the “Journal of Clinical Cardiology and Cardiovascular Interventions” is undeniable. It is a peer-reviewed, open-access publication dedicated exclusively to disseminating high-quality research in the field of clinical cardiology and cardiovascular interventions. The journal's impact factor is currently under evaluation, and it is indexed in reputable databases, which further reinforces its credibility and relevance in the scientific field. I highly recommend this journal to researchers looking for a reputable platform to publish their studies.
Dear Editorial Coordinator of the Journal of Nutrition and Food Processing! "I would like to thank the Journal of Nutrition and Food Processing for including and publishing my article. The peer review process was very quick, movement and precise. The Editorial Board has done an extremely conscientious job with much help, valuable comments and advices. I find the journal very valuable from a professional point of view, thank you very much for allowing me to be part of it and I would like to participate in the future!”
Dealing with The Journal of Neurology and Neurological Surgery was very smooth and comprehensive. The office staff took time to address my needs and the response from editors and the office was prompt and fair. I certainly hope to publish with this journal again.Their professionalism is apparent and more than satisfactory. Susan Weiner
My Testimonial Covering as fellowing: Lin-Show Chin. The peer reviewers process is quick and effective, the supports from editorial office is excellent, the quality of journal is high. I would like to collabroate with Internatioanl journal of Clinical Case Reports and Reviews.
My experience publishing in Psychology and Mental Health Care was exceptional. The peer review process was rigorous and constructive, with reviewers providing valuable insights that helped enhance the quality of our work. The editorial team was highly supportive and responsive, making the submission process smooth and efficient. The journal's commitment to high standards and academic rigor makes it a respected platform for quality research. I am grateful for the opportunity to publish in such a reputable journal.
My experience publishing in International Journal of Clinical Case Reports and Reviews was exceptional. I Come forth to Provide a Testimonial Covering the Peer Review Process and the editorial office for the Professional and Impartial Evaluation of the Manuscript.
