Double Rolling Research Articles

Dislocation Strengthening and Texture Evolution of Non-Oriented Fe-3.3 wt% Si Steel in Double Cold Rolling

Dislocation Strengthening and Texture Evolution of Non-Oriented Fe-3.3 wt% Si Steel in Double Cold Rolling

Metoda poboljšanja potresno izoliranih mostova novim V-MG uređajima: dinamička ispitivanja modela

A method for enhancing the seismic performance of isolated bridges was developed using innovative vertical multigap (V-MG) devices based on extensive experimental and analytical research. Significant improvements in seismic performance were achieved by creating a unique type of uniform V-MG energy-dissipation device for a vertical-gaped bridge protection system (VG bridge system) that included double spherical rolling seismic bearings for seismic isolation as a complete set. Seismic shaking table tests on large-scale bridge models, which simulated real earthquake conditions, confirmed that the VG bridge system could significantly modify seismic response and enhance the seismic safety of isolated bridges under very strong earthquakes.

Adaptive Seismic Upgrading of Isolated Bridges with C-Gapped Devices: Model Testing

The seismic safety margins of seismically isolated bridges have not been thoroughly studied or comprehended due to a lack of actual on-site data observations. This study introduces a newly validated method for the efficient seismic protection of bridges that may be exposed to extremely strong, multidirectional near-source and critical far-source earthquakes. The isolated system was improved by incorporating innovative adaptive horizontal C-multigapped (HC-MG) energy dissipation devices to overcome the safety limitations associated with solely using isolated bridges under seismic loads. The newly developed adaptive C-gapped (ACG) bridge system was systematically validated through extensive experimental seismic tests on bridge models and additional analytical studies. The new ACG bridge system represents an advanced technical solution that integrates the benefits of seismic isolation and energy dissipation. The seismic isolation system for the large-scale ACG bridge prototype was designed using double spherical rolling seismic bearings (DSRSB). The seismic performance of the system was enhanced with adaptive HC-MG energy dissipation devices. The improved seismic performance of the system was demonstrated through extensive seismic shaking-table tests on the ACG bridge prototype, simulating selected seismic inputs characteristic of typical near- and far-source earthquakes. Doi: 10.28991/CEJ-2024-010-09-01 Full Text: PDF

Allosteric probe-initiated double rolling circle amplification in tandem for sensitive whole-cell detection of E. coli O157:H7

The development of facile, reliable nucleic acid amplification assays for pathogenic bacteria is paramount but still poses a challenge. Here we present a molecular amplification system that integrates the whole-cell recognition of allosteric probes with cascaded rolling circle amplification. Allosteric probe-initiated double rolling circle amplification (AID-RCA) assay involves a three-step process that utilizes allosteric probes, dumbbell templates, and circular templates to recognize, amplify, and detect target bacteria, E. coli O157:H7. The allosteric probes are designed to recognize E. coli O157:H7 without bacterial isolation and nucleic acid extraction. Subsequently, the two-stage in-tandem amplification, that is, dumbbell template-based exponential-rolling circle amplification (DT-RCA) and circular template-based linear-rolling circle amplification (CT-RCA), is initiated and yields powerful fluorescence signals using molecular beacon as a signal probe. The symmetric structure of the dumbbell template endows the AID-RCA assay with good specificity. Cascaded signal amplification boosts its sensitivity. The AID-RCA assay demonstrated high sensitivity in the quantitative detection of E. coli O157:H7(limit of detection 1.6 CFU·mL−1). Compared to real-time PCR, the AID-RCA system exhibited higher sensitivity for low concentrations of E. coli O157:H7. Furthermore, the AID-RCA system can selectively differentiate E. coli O157:H7 from other pathogenic bacteria in complex samples such as drinking water and milk. In a blind validation study using milk samples, the AID-RCA system effectively distinguished between contaminated and pasteurized milk samples. Our method is expected to hold great potential for developing precise, reliable, and efficient analytical platforms to combat pathogenic bacterial pollution and safeguard human health.

Oculogyric crisis symptoms related to risperidone treatment: a case report

BackgroundOculogyric crisis (OGC) is a rare focal dystonia of the ocular muscles that not only interferes with patients’ medication adherence but also negatively affects the course and prognosis of the primary disease. Early detection and treatment of OGC can improve patients’ medication adherence and quality of life.Case presentationThis paper reports a case of a 19-year-old Asian female with a diagnosis of schizophrenia who was treated intermittently with atypical antipsychotics aripiprazole or risperidone for 2 years, with improvement of psychotic symptoms during the course of medication, and then developed double eye rolling and staring with irritability when treated with risperidone 4 mg/d or 6 mg/d. Then, we changed the medication to clozapine, and the patient’s psychotic symptoms were controlled and stable. The symptoms of double eye rolling and gaze disappeared.ConclusionOculogyric crisis (OGC) is a rare focal dystonia of the oculogyric muscle. This case provides clinicians with a basis for the early recognition and management of oculogyric crisis during the use of atypical antipsychotics (risperidone).

Gear involute artifacts with sub-micron profile form deviations: manufacture and new design

Gear involute artifact (GIA) is a kind of calibration standard used for traceability of involute metrology. To machine GIAs with sub-micron profile form deviations, the effect on the involute profile deviations caused by the geometric deviations and 6-DoF errors of the machining tool based on the double roller-guide involute rolling generation mechanismwas analysed.At the same time, a double roller-guide involute lapping instrument and a lapping method for GIAs was proposed for lapping and in-situ measuring the gear involute artifacts. Moreover, a new GIA with three design base radii (50 mm, 100 mm, and 131 mm) was proposed for more efficient calibration and was machined with profile form deviations of 0.3 μm (within evaluation length of 38 mm, 68 mm, 80 mm, respectively, measured by the Chinese National Institute of Metrology), and the surface roughness Ra of the involute flanks was less than 0.05 μm. The research supports small-batch manufacturing for high-precision GIAs.

Study on the analysis of cotton ginning machine transmission system

India is the second ranked large cotton producing country of world. Separation of fibre and seed is initial process desired for converting cotton crop to any finished product. Mostly ginning machines are developed as per need and volume of work to be processed. Ginning machine is main processing tool between cotton producers and textile industries. Commonly machines using double roller are utilized in India. As per the need from time to time Indian farmers adopted tools and techniques to provide high-quality cotton to local and overseas textile mills, ginning machines are upgraded step by step to cope up the demands. Twin roller ginning machine needs to be further developed and enhanced so as to improve performance of textile industries. In this paper, the analysis is conducted for betterment of current design. Double roller gin is focused here using analytical analysis for force acting on gears while transmission of torque, as well as balancing of components and thrust force acting on the bearing that creates vibration in the complete ginning machine assembly. Innovative design aspects considered in this work are found to be very effective for improve of double rolling gin machine performance.

Poboljšanje mostova s potresnom izolacijom primjenom horizontalnih uređaja S-oblika (HS)

The conducted extensive experimental seismic analysis showed seismic performances of a constructed large-scale bridge model representing system of upgraded isolated bridge with uniform gapped horizontal S-shaped devices (GHS System). The GHS system constituted double spherical rolling isolating bearings (DSRIB) and created original uniform horizontal S-shaped multi-gap (HS-MG) energy dissipation devices. With conducted laboratory cyclic tests, stable all-directional hysteretic responses were confirmed for both the DSRIB and HS-MG devices. In the dynamic seismic shaking table testing, the GHS bridge system showed favourable seismic response performances contributing to efficient bridge system protection. The established new GHS system exhibited large potential for qualitative improvement of seismic safety of isolated bridges exposed to very strong earthquakes.

Accuracy improvement method for double flank worm gear pair rolling tester

To improve the measurement accuracy of the double flank worm gear pair rolling tester, the grating system is calibrated by laser interferometer and then compensation model using polynomial function is established, uncertainty budget is carried out based on the sensitivity test and error sources analysis, and some factors are adjusted to lower the measurement uncertainty. After compensation, the positioning error of worm gear moving slider, worm slider and worm gear measuring slider is reduced from 1.80 μm to 0.20 μm, 20.00 μm to 0.50 μm, and from 0.70 μm to 0.05 μm respectively. Related sensitivity coefficients for measurement results total radial composite deviation Fid, tooth-to-tooth radial composite deviation fid,andrunoutFr are within 0.01 to 0.04. According to GUM, three parts are considered in uncertainty evaluation including standard uncertainty of base unit, standard uncertainty of data acquisition & software system and standard uncertainty of measurement condition. After the optimization of the main error sources, the expanded uncertainty for measurement results Fid, fid,Fr is reduced from 5.4 μm, 4.6 μm and 2.5 μm to 2.6 μm, 2.1 μm and 1.5 μm respectively. The experimental results show that, the accuracy improvement method for double flank worm gear pair rolling tester can reduce measurement uncertainty, and the whole work can be a certain reference for the accuracy improvement of precision instruments.

Mechanical model for double side self-propelled rolling machine based on rigid and flexible contact dynamics

Mechanical model for double side self-propelled rolling machine based on rigid and flexible contact dynamics

Intelligent Health Diagnosis of Lithium Battery Pole Double Rolling Equipment Driven by Hybrid BP Neural Network and Expert System

At present, the fault diagnosis methods of lithium battery pole rolling mill mostly rely on manual experience and the self-test function of mature control devices such as frequency converters and lack the ability of intelligent fault diagnosis for the whole equipment and the ability to evaluate the health state of the equipment during operation. To improve the intellectual health diagnosis ability of lithium battery pole double rolling mill equipment, starting from the structure and technology of lithium battery pole double rolling equipment, this paper analyzes its common fault types. It summarizes the shortcomings and common fault types of existing equipment. Then, we introduce fuzzy reasoning into the fault diagnosis method based on Expert Systems and establish the FEFDM of lithium battery pole double rolling equipment. Finally, we introduce the concept of health degree, effectively connect BP neural network and health degree through the fuzzy set, and establish an equipment operation health state evaluation method based on an improved BP Neural Network, which realizes the evaluation ability of the health state of double roller equipment. In addition, we use Extended Kalman Filtering (EKF) to clean the “dirty data” and filter out the Gaussian white noise from the signal. The health diagnosis method proposed in this paper can meet the ability to accurately locate and diagnose the fault of lithium battery pole double roller equipment and evaluate the health state of equipment operation and maintain the equipment in advance.

Design Improvements of Vane Bearing Compressor

A variant of vane bearing compressor with double rolling bearing had been introduced two years ago (Hu and Xu, 2019). In order to solve the problems of complex assembly process and abnormal wear in the vane bearing compressor with double rolling bearing, this paper presents a type of improved vane bearing compressor with single rolling bearing. The improved vane bearing compressor integrates the rolling bearings and the cylinder into a rolling bearing cylinder unit. The suction t and discharge ports are placed on the end face of the main bearing. With these improvements, the number of the end face friction pairs of rolling bearing inner ring is reduced by half, the number of parts is reduced accordingly, and the assembly process is thus made simpler than that with double rolling bearing. This paper introduces the operational characteristics and makes a series of structure optimization to improve the performance of the improved vane bearing compressor with single rolling bearing. The energy efficiency of the improved vane bearing compressor with single rolling bearing is found to be 5% higher than that with the double rolling bearing.

Upgrading of isolated bridges with space-bar energy-dissipation devices: Shaking table test

The results of the experimental research program realized on a bridge model constructed by using the seismically isolated system upgraded with space-bar devices (USI-SB) are presented in the paper. The installed adaptable system for seismic protection of bridges utilizes double spherical rolling seismic bearings (DSRSB) as seismic isolators, while the qualitative improvement of seismic performances is achieved through the use of novel adjustable multi-directional space-bar energy dissipation (SB-ED) devices. The experimental program consisted of quasi-static testing of isolation and energy dissipation devices under the cyclic loading and extensive shaking-table testing of a large-scale bridge model with installed USI-SB system. For both types of devices, a very stable all-directional response during cycling tests, as well as the favorable hysteretic behavior of the energy dissipation devices along the entire range of applied large displacements were registered. In the dynamic testing, the system showed high seismic response modification performances needed for the efficient protection, exhibiting its large potential in the qualitative improvement of seismic performances of isolated bridges.

Organizational-and-technological solutions for installation of prefabricated roof coverings from roll materials

Implementing the modern technological methods is recommended in the article, as well as performing some operations. It should be considered that small and medium-sized enterprises involved in the construction of industrial and civil facilities are also installing the roof coverings. The algorithm of technological operations is as follows: preparatory work; gluing a two-layer waterproofing roofing on freshly formed reinforced concrete panels; double rolling of the uncooled roll roofing after removing the panel from the steam chamber. The process of installing the waterproofing roofing has to be carried out in a specially equipped enterprise area. It is recommended to use the following domestic and foreign tools and equipment for above-mentioned operations. Such equipment is a truck crane (for example, KS-45717), a roof crane (KL-3), a temporary fence, a metal ruler, a tape measure, roller or a brush, a scraper, a roofing knife and a roller (weight is 100 kg).The rational methods of roofing installation (based on labor intensity) are presented. As was substantiated, the calculation of labor can change while improving the technology and the tools and equipment used. The quality control of operations is described, it involves visual inspections and the necessary measurements performed with a ruler. Optimal organizational and technological solutions, which allow to manage processes taking into account the safety of workers, were obtained. Fulfilling the labor safety requirements during construction (part 1 and part 11) is primary while installing the roll-up waterproofing roofing made of melting roofing material with the help of a solvent. In addition, it should be noted that the workplaces and storage locations with flammable materials and substances have to be provided with a portable fire stand, as well as with fire extinguishing and medical equipment. The conclusions and recommendations on organizational and technological solutions forin stalling the prefabricated roofing from roll materials by using mechanization means are presented. They are intended for developers of organizational and technological documentation, including flow charts, work projects, regulations, codes of rules. They will be useful for students, masters, graduate students studying for professions related to the production of building, erection and special works.

Combination of Immunomagnetic Separation with Aptamer-Mediated Double Rolling Circle Amplification for Highly Sensitive Circulating Tumor Cell Detection.

Breast cancer is the most frequently diagnosed cancer among women, and the circulating tumor cell (CTC)-meditated distant metastasis is the leading cause of death. Thus, the detection of CTCs is of great importance for the early diagnosis of breast cancer and the prevention of metastasis. In this study, using human breast carcinoma BT474 cells as the model CTCs, a powerful assay platform is demonstrated by fluorescence spectrometry for the highly sensitive CTC detection by combining the dual-recognizing elements receptor-binding antibody and aptamer-mediated separation with double rolling circle amplification reactions (d-RCA, including RCA1 and RCA2). The aptamer-inserted RCA1 product (RCA1-p) exhibits the considerably improved affinity towards target cells originating from the multivalent binding effect. The immunomagnetic separation removes nontarget cells coexisting in complex biological milieu, while the centrifugal separation of cells/DNAs mixture eliminates the excess probes, thereby circumventing the unwanted interferences. The fluorescence spectrometric results show that a 34-fold enhanced fluorescence signal is achieved upon BT474 cells, and the target cells can be quantitatively detected down to 9 cells/200 μL with the linear range of five orders of magnitude, indicating a significantly enhanced detection performance. Even if BT474 cells are spiked in the fresh whole blood, no obvious fluctuation in the fluorescence signal is detected, demonstrating that the newly developed d-RCA assay system is suitable for screening CTCs in complex environments and is expected to be a promising tool for estimating distant metastasis and predicting the recurrence of tumors.

Study on the metal flow behaviour of deformation areas of large ring radial-axial rolling process

Ring radial-axial rolling technology is the best method to produce high quality large seamless ring. The metal flow behaviour of deformation areas of large ring radial-axial rolling process is studied. It is found that the fishtail pit of up-down surface of the ring section arises after the section passes through radial rolling area and that of in-out surface of the ring section arises after the section passes through axial rolling area. In order to gain better ring section, single radial rolling process is needed to remove the fishtail pit of in-out surface after double radial-axial rolling process. The study is very useful to constitute the process scheme of large ring radial-axial rolling.

Establishment of double probes rolling circle amplification combined with lateral flow dipstick for rapid detection of Chattonella marina

Chattonella marina is one of the main algae that could cause harmful algal blooms. It has killed a large number of cultured fish in coastal areas of many countries, causing serious economic losses. Therefore, it is necessary to establish a method that can specifically detect C. marina at pre-bloom abundance, so that timely measures can be taken before this alga causes harm. In this study, a long probe, a short probe and a pair of amplification primers were first designed by using the internal transcribed spacer (ITS) sequence of C. marina as the target gene and using the CD74 gene of a distant species Gallus gallus as the base sequence. The double probes rolling circle amplification (dpRCA) system was then established with the designed probes and amplification primers. A novel detection protocol referred to as dpRCA-LFD by combining the dpRCA products and lateral flow dipstick (LFD) was finally established, which can make the detection results visible to the naked eyes. The reaction conditions of dpRCA were optimized and the optimal conditions were as follows: cycle number of ligation reaction, 12; ligation temperature, 58 °C; amplification temperature, 60 °C; and amplification time, 60 min. The specificity test that was performed using the optimized dpRCA conditions indicated that dpRCA-LFD was exclusively specific for the target alga. The tests with the genomic DNA of C. marina and the recombinant plasmid containing the ITS sequence of C. marina showed that the sensitivity of dpRCA-LFD was 100 times higher than that of conventional PCR. The detection limit (DL) for the genomic DNA was 8.3 × 10−3 ng µL−1 (8.3 × 10−3 ng per reaction), and the DL for the recombinant plasmid DNA was 7.8 copies µL−1 (7.8 copies per reaction). The practicality of the developed dpRCA-LFD was further validated by test with the spiked samples containing C. marina and field samples. The simulative test showed that the dpRCA-LFD has a DL of 10 cells mL−1. The dpRCA-LFD could successfully recognize the target cells from the field samples. In summary, the dpRCA-LFD established in this study has advantages of good specificity, high sensitivity, and easily visible detection results, and therefore is promising for the analysis of C. marina in field samples.

Formation Mechanism and Influence Factors of Roll Surface Oil Film Thickness in the Double Cold Reduction Mill

In the double cold rolling process, the emulsion entering the roll gap during the double cold rolling process has the characteristics of high concentration and small flow rate so that the roll surface oil film thickness will affect roll gap oil film thickness, which in turn affects the rolling friction coefficient. This paper analyzes the formation mechanism and evolution process of the roll surface oil film thickness by considering the equipment and process characteristics of the emulsion direct injection application lubrication system. Then, based on the principle of fluid dynamics, the roll surface oil film thickness model in the double cold rolling process is established, and the prediction of the roll surface oil film thickness during the double cold rolling process is realized. Subsequently, the effects of five factors, such as rolling speed, work roll roughness, maximum contact stress between rolls, emulsion initial dynamic viscosity, and emulsion pressure viscosity coefficient, on the roll surface oil film thickness are quantitatively analyzed, and the corresponding influence laws are given. Finally, the relevant model and software that are applied to the 1220 double cold reduction mill have achieved good results.

Double Rolling Circle Amplification Generates Physically Cross-Linked DNA Network for Stem Cell Fishing.

Stem cells have been widely studied in cell biology and utilized in cell-based therapies, and fishing stem cells from marrow is highly challenging due to the ultralow content. Herein, a physically cross-linked DNA network-based cell fishing strategy is reported, achieving efficient capture, 3D envelop, and enzyme-triggered release of bone marrow mesenchymal stem cells (BMSCs). DNA network is constructed via a double rolling circle amplification method and through the intertwining and self-assembly of two strands of ultralong DNA chains. DNA-chain-1 containing aptamer sequences ensures specific anchor with BMSCs from marrow. Hybridization between DNA-chain-1 and DNA-chain-2 enables the cross-link of cell-anchored DNA chains to form a 3D network, thus realizing cell envelop and separation. DNA network creates a favorable microenvironment for 3D cell culture, and remarkably the physically cross-linked DNA network shows no damage to cells. DNA network is digested by nuclease, realizing the deconstruction from DNA network to fragments, and achieving enzyme-triggered cell release; after release, the activity of cells is well maintained. The strategy provides a powerful and effective method for fishing stem cells from tens of thousands of nontarget cells.

On the Euler–Lagrange Equation for Planar Systems of Rigid Bodies or Lumped Masses

The Euler–Lagrange equation is frequently used to develop the governing dynamic equilibrium expressions for rigid-body or lumped-mass systems. In many cases, however, the rectangular coordinates are constrained, necessitating either the use of Lagrange multipliers or the introduction of generalized coordinates that are consistent with the kinematic constraints. For such cases, evaluating the derivatives needed to obtain the governing equations can become a very laborious process. Motivated by several relevant problems related to rigid-body structures under seismic motions, this paper focuses on extending the elegant equations of motion developed by Greenwood in the 1970s, for the special case of planar systems of rigid bodies, to include rigid-body rotations and accelerating reference frames. The derived form of the Euler–Lagrange equation is then demonstrated with two examples: the double pendulum and a rocking object on a double rolling isolation system. The work herein uses an approach that is used by many analysts to derive governing equations for planar systems in translating reference frames (in particular, ground motions), but effectively precalculates some of the important stages of the analysis. It is hoped that beyond re-emphasizing the work by Greenwood, the specific form developed herein may help researchers save a significant amount of time, reduce the potential for errors in the formulation of the equations of motion for dynamical systems, and help introduce more researchers to the Euler–Lagrange equation.