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Article ; Online: Asymptotic stability of spiky steady states for a singular chemotaxis model with signal-suppressed motility.

Song, Xu / Li, Jingyu

Mathematical biosciences and engineering : MBE

2023 Volume 19, Issue 12, Page(s) 13988–14028

Abstract: We study the nonlinear stability of spiky solutions to a chemotaxis model of consumption type with singular signal-suppressed motility in the half space. We show that, when the no-flux boundary condition for the bacteria density and the nonhomogeneous ... ...

Abstract	We study the nonlinear stability of spiky solutions to a chemotaxis model of consumption type with singular signal-suppressed motility in the half space. We show that, when the no-flux boundary condition for the bacteria density and the nonhomogeneous Dirichlet boundary condition for the nutrient are prescribed, this chemotaxis model admits a unique smooth spiky steady state, and it is nonlinearly stable under appropriate perturbations. The challenge of the problem is that there are two types of singularities involved in the model: one is the logarithmic singularity of the sensitive function; and the other is the inverse square singularity of the motility. We employ a Cole-Hopf transformation to relegate the former singularity to a nonlocality that can be resolved by the method of anti-derivative. To deal with the latter singularity, we construct an approximate system that retains a key structure of the original singular system in the local theory, and develop a new strategy, which combines a weighted elliptic estimate and the weighted energy estimate, to establish a priori estimate in the global theory.
MeSH term(s)	Humans ; Chemotaxis ; Models, Biological ; Hospitalization ; Nutrients
Language	English
Publishing date	2023-01-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	2265126-3
ISSN	1551-0018 ; 1551-0018
ISSN (online)	1551-0018
ISSN	1551-0018
DOI	10.3934/mbe.2022652
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Piezoelectric-laser ultrasonic inspection and monitoring of thin-walled structure fabricated by directed energy deposition process based on guided waves.

Wen, Fuzhen / Gao, Shiming / Song, Xu / Shi, Fan

Ultrasonics

2024 Volume 138, Page(s) 107255

Abstract: Thin-walled metallic structures produced by the Directed Energy Deposition (DED) Additive Manufacturing (AM) process are prone to various fabrication defects, which hinder the wider applications of the technique in practice. In-situ inspection and ... ...

Abstract	Thin-walled metallic structures produced by the Directed Energy Deposition (DED) Additive Manufacturing (AM) process are prone to various fabrication defects, which hinder the wider applications of the technique in practice. In-situ inspection and monitoring methodologies are in high demand for improved quality control of printed parts. This paper presents an ultrasonic guided-wave-based method and a prototype that can potentially be used for in-situ inspection of thin-walled structures produced by DED. Lamb waves are excited by a Lead zirconate titanate (PZT) piezoelectric transducer bonded on the DED substrate remotely from the thin wall. The substrate works as a waveguide to transmit the waves which then propagate along the thin wall. A non-contact laser vibrometer is applied to measure the guide wave signals by scanning the surface of the thin wall. The mechanisms of guided wave generation and propagation along the substrate and printed part are theoretically studied. It allows for choosing proper inspection parameters to enhance the measurement sensitivity of guided waves and help interpret the signals for defect detection. Experiments were conducted with DED-produced stainless steel (316L) thin-walled structure. The new method is demonstrated in one example to detect and localize a small defect caused by inconsistent powder delivery of a fabricated thin wall sample, via analysing the B-scan ultrasonic guided wave signals. The new technique provides strong potential for in-situ online monitoring of the DED process.
Language	English
Publishing date	2024-01-28
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	200839-7
ISSN	1874-9968 ; 0041-624X
ISSN (online)	1874-9968
ISSN	0041-624X
DOI	10.1016/j.ultras.2024.107255
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Article ; Online: Cornual invasive hydatidiform mole

Jing Qian / Song Xu / Li Chen

BMC Women's Health, Vol 23, Iss 1, Pp 1-

a rare case report and literature review

2023 Volume 4

Abstract: Abstract Background The cornual pregnancy is a rare condition of ectopic pregnancies. Invasive hydatidiform mole is a rare form of gestational trophoblastic diseases. Cornual invasive hydatidiform mole is extremely rare. Case presentation A 17-year-old ... ...

Abstract	Abstract Background The cornual pregnancy is a rare condition of ectopic pregnancies. Invasive hydatidiform mole is a rare form of gestational trophoblastic diseases. Cornual invasive hydatidiform mole is extremely rare. Case presentation A 17-year-old girl presented to the gynecology department with irregular vaginal bleeding. This patient was diagnosed with cornual invasive hydatidiform mole. Mono-chemotherapy was admitted firstly and with poor efficacy. The patient was cured by a combination of chemotherapy and resection of the uterine mass. Conclusion Cases with cornual invasive hydatidiform mole are extremely rare conditions. Unlike common site of invasive hydatidiform mole, mono-chemotherapy may be insufficient for cornual invasive hydatidiform mole. Chemotherapy in combination with other treatments may be needed in this rare condition.
Keywords	Ectopic pregnancy ; Chemotherapy ; Gestational trophoblastic disease ; Mole pregnancy ; Invasive mole ; Gynecology and obstetrics ; RG1-991 ; Public aspects of medicine ; RA1-1270
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	BMC
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Pd-Catalyzed Enantioselective Creation of All-Carbon Quaternary Center with 2,3-Allenylic Carbonates.

Lin, Jie / Jia, Minqiang / Song, Xu / Yu, Hao / Ma, Shengming

Organic letters

2024 Volume 26, Issue 12, Page(s) 2349–2353

Abstract: Enantioselective construction of all-carbon quaternary centers has been achieved via the palladium-catalyzed highly enantioselective allenylation of oxindoles with 2,3-allenylic carbonates to afford a variety of optically active allene products, which ... ...

Abstract	Enantioselective construction of all-carbon quaternary centers has been achieved via the palladium-catalyzed highly enantioselective allenylation of oxindoles with 2,3-allenylic carbonates to afford a variety of optically active allene products, which contain oxindole units with different functional groups, in high ee. The corresponding synthetic applications have also been demonstrated.
Language	English
Publishing date	2024-03-15
Publishing country	United States
Document type	Journal Article
ISSN	1523-7052
ISSN (online)	1523-7052
DOI	10.1021/acs.orglett.2c02497
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Article ; Online: Integrative chemical and multiomics analyses of tetracycline removal mechanisms in Pseudomonas sp. DX-21.

Yang, Mengya / Ma, Yifei / Song, Xu / Miao, Jingwen / Yan, Lilong

Journal of hazardous materials

2024 Volume 470, Page(s) 134123

Abstract: Tetracycline (TC), widely found in various environments, poses significant risks to ecosystems and human health. While efficient biodegradation removes TC, the mechanisms underlying this process have not been elucidated. This study investigated the ... ...

Abstract	Tetracycline (TC), widely found in various environments, poses significant risks to ecosystems and human health. While efficient biodegradation removes TC, the mechanisms underlying this process have not been elucidated. This study investigated the molecular mechanisms underlying TC biosorption and transfer within the extracellular polymeric substances (EPS) of strain DX-21 and its biodegradation process using fourier transform infrared spectroscopy, molecular docking, and multiomics. Under TC stress, DX-21 increased TC biosorption by secreting more extracellular polysaccharides and proteins, particularly the latter, mitigating toxicity. Moreover, specialized transporter proteins with increased binding capacity facilitated TC movement from the EPS to the cell membrane and within the cell. Transcriptomic and untargeted metabolomic analyses revealed that the presence of TC led to the differential expression of 306 genes and significant alterations in 37 metabolites. Notably, genes related to key enzymes, such as electron transport, peroxidase, and oxidoreductase, exhibited significant differential expression. DX-21 combated and degraded TC by regulating metabolism, altering cell membrane permeability, enhancing oxidative defense, and enhancing energy availability. Furthermore, integrative omics analyses indicated that DX-21 degrades TC via various enzymes, reallocating resources from other biosynthetic pathways. These results advance the understanding of the metabolic responses and regulatory mechanisms of DX-21 in response to TC.
MeSH term(s)	Tetracycline/toxicity ; Tetracycline/metabolism ; Pseudomonas/metabolism ; Pseudomonas/genetics ; Pseudomonas/drug effects ; Biodegradation, Environmental ; Anti-Bacterial Agents/toxicity ; Molecular Docking Simulation ; Metabolomics ; Bacterial Proteins/metabolism ; Bacterial Proteins/genetics ; Transcriptome/drug effects ; Multiomics
Chemical Substances	Tetracycline (F8VB5M810T) ; Anti-Bacterial Agents ; Bacterial Proteins
Language	English
Publishing date	2024-03-27
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2024.134123
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Article ; Online: Pricing of Embedded Options in Bank Deposits and Loans Based on Jump-Diffusion Interest Rate Model

Enlin Tang / Song Xu

Complexity, Vol

2021 Volume 2021

Abstract: The marketization of interest rate is an inevitable requirement for China’s financial reform and joining the WTO to connect with the international financial market. It is also an important link to improve the marketization degree of China’s financial ... ...

Abstract	The marketization of interest rate is an inevitable requirement for China’s financial reform and joining the WTO to connect with the international financial market. It is also an important link to improve the marketization degree of China’s financial system. The marketization of interest rate in China is gradually advancing according to its preset mode. In the process of interest rate marketization, an unavoidable problem is that while the interest rate marketization gives the commercial banks the autonomy of capital pricing, the fluctuation of interest rate is more and more frequent. However, due to the fluctuation of interest rate, the loan as the main assets of commercial banks will be prepayed by borrowers, and the time deposit as the main liabilities of commercial banks will be withdrawn by depositors in advance; that is, embedded options are implied in asset liability items, which makes it difficult for commercial banks to accurately calculate the actual interest margin of deposits and loans and manage the interest rate risk. Therefore, it is of great significance to identify and price such embedded option value. On the basis of identifying and decomposing the embedded options in deposit and loan of commercial banks, according to the change characteristics of deposit and loan interest rate of Chinese commercial banks, this paper chooses jump-diffusion interest rate model to describe the change of benchmark interest rate of deposit and loan in China and demonstrates the advantages of this model compared with other models. Based on Monte Carlo simulation technology, the embedded options of five-year fixed deposit and ten-year prepayable loan in China are priced. On this basis, it points out that the real interest margin of commercial bank’s deposit and loan should be the nominal interest margin minus the value of deposit and loan’s embedded options. In the process of interest rate risk management, we should pay attention to the existence of embedded options and carry out effective management.
Keywords	Electronic computers. Computer science ; QA75.5-76.95
Subject code	332
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Hindawi-Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Research on Evaluation of Green Smart Building Based on Improved AHP-FCE Method

Song Xu / Yao Sun

Computational Intelligence and Neuroscience, Vol

2021 Volume 2021

Abstract: With the accelerated pace of urbanization, green buildings and green smart buildings gradually come into people’s vision and are highly valued by all sectors of society on the premise of meeting sustainable development strategy. Firstly, this paper ... ...

Abstract	With the accelerated pace of urbanization, green buildings and green smart buildings gradually come into people’s vision and are highly valued by all sectors of society on the premise of meeting sustainable development strategy. Firstly, this paper selects 7 first-level index factors and 20 second-level index factors to establish the green smart building evaluation system. Secondly, this paper uses the analytic hierarchy process-fuzzy comprehensive evaluation (AHP-FCE) method to determine the weight of each secondary index. Finally, the feasibility of the evaluation system is verified by case analysis, and some suggestions on green smart building are put forward.
Keywords	Computer applications to medicine. Medical informatics ; R858-859.7 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Hindawi Limited
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Development and pilot testing of an online training program for better use of internet to learn about depression and anxiety (BUILDA).

Gu, Yulong / Kalibatseva, Zornitsa / Song, Xu / Prakash, Sreelekha

Journal of education and health promotion

2023 Volume 12, Page(s) 363

Abstract: Background: Depression and anxiety are common issues among college students in the United States. Although college students routinely use the Internet for information regarding their mental health, they might lack the digital health literacy required to ...

Abstract	Background: Depression and anxiety are common issues among college students in the United States. Although college students routinely use the Internet for information regarding their mental health, they might lack the digital health literacy required to search, evaluate, and use Internet resources. Materials and methods: A web-based short training program with four modules aimed to improve mental health literacy and digital health literacy for Better Use of Internet to Learn about Depression and Anxiety (BUILDA). BUILDA was tested in a pilot study with 10 undergraduate students who completed the program and provided feedback via online surveys and exit interviews. Participants completed a pretest and a post-test, which included health literacy instruments and realistic case scenarios to assess student knowledge and ability to search and use Internet information on mental health topics. Descriptive analyses and paired Results: Increased knowledge about mental health topics was observed in pilot participants, with improvement in mean values of depression literacy ( Conclusions: It was feasible to deliver a short training program via a simple website to help students develop mental health literacy and digital health skills.
Language	English
Publishing date	2023-10-31
Publishing country	India
Document type	Journal Article
ZDB-ID	2715449-X
ISSN	2319-6440 ; 2277-9531
ISSN (online)	2319-6440
ISSN	2277-9531
DOI	10.4103/jehp.jehp_1761_22
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Article: Monocular camera and laser based semantic mapping system with temporal-spatial data association for indoor mobile robots.

Song, Xu / Zhijiang, Zuo / Liang, Xuan / Huaidong, Zhou

Multimedia tools and applications

2023 , Page(s) 1–26

Abstract: In the future, the goal of service robots is to operate in human-centric indoor environments, requiring close cooperation with humans. In order to enable the robot to perform various interactive tasks, it is necessary for robots to perceive and ... ...

Abstract	In the future, the goal of service robots is to operate in human-centric indoor environments, requiring close cooperation with humans. In order to enable the robot to perform various interactive tasks, it is necessary for robots to perceive and understand environments from a human perspective. Semantic map is an augmented representation of the environment, containing both geometric information and high-level qualitative features. It can help the robot to comprehensively understand the environment and bridge the gap in human-robot interaction. In this paper, we propose a unified semantic mapping system for indoor mobile robots. This system utilizes the techniques of scene classification and object detection to construct semantic representations of indoor environments by fusing the data of a camera and a laser. In order to improve the accuracy of semantic mapping, the temporal-spatial correlation of semantics is leveraged to realize data association of semantic maps. Also, the proposed semantic mapping system is scalable and portable, which can be applied to different indoor scenarios. The proposed system was evaluated with collected datasets captured in indoor environments. Extensive experimental results indicate that the proposed semantic mapping system exhibits great performance in the robustness and accuracy of semantic mapping.
Language	English
Publishing date	2023-03-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	1479928-5
ISSN	1573-7721 ; 1380-7501
ISSN (online)	1573-7721
ISSN	1380-7501
DOI	10.1007/s11042-023-14796-1
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Article ; Online: Recurrent Neural Network-Based Temperature Control System Weight Pruning Based on Nonlinear Reconstruction Error

Yuan Liu / Takahiro Kawaguchi / Song Xu / Seiji Hashimoto

Processes, Vol 10, Iss 44, p

2022 Volume 44

Abstract: Recurrent Neural Networks (RNNs) have been widely applied in various fields. However, in real-world application, because most devices like mobile phones are limited to the storage capacity when processing real-time information, an over-parameterized ... ...

Abstract	Recurrent Neural Networks (RNNs) have been widely applied in various fields. However, in real-world application, because most devices like mobile phones are limited to the storage capacity when processing real-time information, an over-parameterized model always slows down the system speed and is not suitable to be employed. In our proposed temperature control system, the RNN-based control model processes the real-time temperature signals. It is necessary to compress the trained model with acceptable loss of control performance for further implementation in the actual controller when the system resource is limited. Inspired by the layer-wise neuron pruning method, in this paper, we apply the nonlinear reconstruction error (NRE) guided layer-wise weight pruning method on the RNN-based temperature control system. The control system is established based on MATLAB/Simulink. In order to compress the model size to save the memory capacity of temperature controller devices, we first prove the validity of the proposed reference-model (ref-model) guided RNN model for real-time online data processing on an actual temperature object; relative experiments are implemented based on a digital signal processor. On this basis, we then verified the NRE guided layer-wise weight pruning method on the well-trained temperature control model. Compared with the classical pruning method, experiment results indicate that the pruned control model based on NRE guided layer-wise weight pruning can effectively achieve the high accuracy at targeted sparsity of the network.
Keywords	recurrent neural networks ; temperature control system ; layer-wise weight pruning ; nonlinear reconstruction error ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
Subject code	600
Language	English
Publishing date	2022-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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