bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of Aquifer Hydraulic Parameters Using Geo-electric Method in the Dukwi Wellfields, North-eastern Botswana
Authors: Lekone Omphile Sidney , Tafesse Nata T. , Ranganai Rubeni Tawanda , Laletsang Kebabonye , Masaka Tebogo L. 
Published: June 2023

Abstract

Aquifer hydraulic parameters were estimated using geo-electric methods in the Dukwi wellfields, northeastern Botswana. 16 vertical electrical sounding (VES) were recorded using the Schlumberger electrode configuration with maximum half current electrode spacing of 500 m. The data were inverted using the Interpex RESIXIPtm software. In-situ measurements of physico-chemical parameters were conducted in 19 groundwater samples. Pumping test data were also analyzed to determine aquifer hydraulic parameters. Statistical and linear regression models were used for the interpretation of the data. The main aquifer is the Mea Arkose formation, and its average estimated hydraulic conductivity and transmissivity is 31.60 m/day and 1442 m2/day, respectively. The mean transverse resistance and longitudinal conductance of the aquifer and the rock overlying the aquifer, respectively, is 1932 Ωm2 and 4.57 Ω-1. The R2 value for the geo-electrical and pumping test hydraulic conductivity and transmissivity values is 0.6871 and 0.8896, respectively. The estimated hydraulic conductivity has a positive and good correlation (R2 = 0.6606) with the resistivity and a strong correlation coefficient (R2 = 0.8948) is obtained between the transmissivity of the aquifer and the Transverse resistance. Based on the correlations, equations that relate the resistivity of the aquifer to the hydraulic parameters such as transmissivity and hydraulic conductivity were formulated. These equations enable the determination of the aquifer hydraulic parameters where there is a paucity of pumping test data. Furthermore, these equations can be used in other parts of the country, and elsewhere, that have similar geological sequences and hydrogeological setup.
Quantum Circuit Optimization of Arithmeticcircuits using ZX Calculus
Authors: Joshi Aravind , Kairali Akshara , Raju Renju , Athreya Adithya , Vishwakarma Sanjay , Ganguly Srinjoy , P Reena Monica 
Published: June 2023

Abstract
Quantum computing is an emerging technology in which quantum mechanicalproperties are suitably utilized to perform certain compute-intensive operationsfaster than classical computers. Quantum algorithms are designed as a combinationof quantum circuits that each require a large number of quantum gates,which is a challenge considering the limited number of qubit resources available inquantum computing systems. Our work proposes a technique to optimize quantumarithmetic algorithms by reducing the hardware resources and the numberof qubits based on ZX calculus. We have utilised ZX calculus rewrite rules forthe optimization of fault-tolerant quantum multiplier circuits where we are ableto achieve a significant reduction in the number of ancilla bits and T-gates ascompared to the originally required numbers to achieve fault-tolerance. Our workis the first step in the series of arithmetic circuit optimization using graphicalrewrite tools and it paves the way for advancing the optimization of various complexquantum circuits and establishing the potential for new applications of thesame
Effective Estimation of Trapping/Stability Regions and Bilateral Solutions’ Bounds for Some Multidimensional Nonlinear Systems with Time-Varying Coefficients
Authors: Pinsky Mark 
Published: June 2023

Abstract
Assessment of the stability/boundedness of solutions to nonlinear systems with variable coefficients brings long-standing and challenging problems which emerge in various application domains. These problems are naturally evolved into more arduous and largely open problems concerned with the estimation of the corresponding stability/boundedness regions. This paper develops a novel approach furnishing computationally tractable boundedness/stability criteria which underscores a methodology providing recursive estimation of the boundaries of the trapping/stability regions for a broad class of multidimensional and nonlinear systems with variable nonperiodic coefficients. Furthermore, our approach naturally conveys the bilateral bounds for the norms of solutions to the corresponding systems via the application of successive approximations which are introduced in this paper. The developed techniques are validated in inclusive simulations which endorse their applications to systems with large and complex nonlinear components and bounded in-norm time-varying disturbances.
An efficient network based on double constrained loss for fabric image retrieval
Authors: Gui Jiangsheng , Wu Dongwei 
Published: June 2023

Abstract
In order to efficiently retrieve the same or similar fabric samples, a fabric image retrieval model based on deep hashing is proposed. The model is improved on the basis of MobileNetV1, and the performance of the model is improved by combining the h-swish activation function and attention mechanism module. The hashing method is used to solve the problem of low feature matching speed caused by high dimensional feature output. By combining the label information and similarity information of the images, a new loss function is constructed, which solves the problem of low model accuracy caused by the large feature difference between similar samples and the small feature difference between heterogeneous samples in fabric images. The experimental results on self-built fabric image dataset showed that the feature extraction time of the proposed algorithm was 0.25ms, and the MAP reached 93.2%, which can take into account the fabric retrieval speed and improve retrieval accuracy at the same time, and has certain application prospects.
Unlocking the power of Twitter communities for startups
Authors: Peixoto Ana Rita , de Almeida Ana , António Nuno , Batista Fernando , Ribeiro Ricardo , Cardoso Elsa 
Published: June 2023

Abstract
Social media platforms offer cost-effective digital marketing opportunities to monitor the market, create user communities, and spread positive opinions. They allow companies with fewer budgets, like startups, to achieve their goals and grow.In fact, studies found that startups with active engagement on those platforms have a higher chance of succeeding and receiving funding from venture capitalists.Our study is focused on exploring how startups utilize social media platforms to foster social communities. We also aim to characterize the individuals within these communities. The findings from this study underscore the importance of social media for startups.We used network analysis and visualization techniques to investigate the communities of Portuguese IT startups through their Twitter data. For that, a social digraph has been created, and its visualization shows that each startup created a community with a degree of overlap. The overlap of users between communities was characterized using user node-level measures. The results indicate that users in the Portuguese IT startup communities overlap and are of the following types: person, company, blog, venture capital/investor, IT Event, incubator/accelerator, startups, and university. Furthermore, startups follow users who post high volumes of tweets and have high popularity levels, while those who follow them have low activity and are unpopular. The attained results reveal the power of Twitter communities and offer essential insights for startups to consider when building their social media strategies. Lastly, this study proposes a methodological process for social media community analysis on platforms like Twitter.
Experimental study on mechanical damage characteristics of water-bearing tar-rich coal under microwave radiation
Authors: Yang Pan , Shan Pengfei , xu Huicong , Chen Jiageng , Li Zhiyong , Sun Haoqiang 
Published: June 2023

Abstract

As a recognized special resource, tar-rich coal can extract the country 's scarce oil and gas resources and generate semi-coke that can replace anthracite and coking coal. The tar-rich coal in northern Shaanxi is prominent, but due to the dense structure and high strength of tar-rich coal, it is easy to cause frequent dynamic disasters in coal mining. Therefore, the realization of pressure relief and disaster reduction has become the primary problem in mining tar-rich coal. There are many shortcomings in conventional pressure relief methods, so a new method of microwave weakening coal is proposed. Through different water saturation treatment of tar-rich coal samples, the longitudinal wave velocity degradation trend and surface crack expansion law of water-bearing coal after microwave irradiation were analyzed, and the strength softening characterization and energy evolution relationship under the combined action of microwave and water were studied. Fractal dimension and its internal correlation based on the equivalent side length-mass of coal sample fragments. The experimental results show that : (1) Under the same microwave radiation condition, with the increase of water saturation, the deterioration trend of physical and mechanical parameters such as longitudinal wave velocity and peak strength is obvious. (2) After microwave radiation, the uniaxial compression results show that the coal sample is damaged by load, there is still a high residual strength, the ratio of elastic energy to dissipation energy decreases, and the possibility of rockburst of coal sample decreases. The strength softening degree of coal specimen under the codegradation of microwave and water is the highest, followed by microwave and water. (3) The fractal dimension is inversely proportional to the moisture content and microwave radiation intensity, and the fractal dimension has a significant positive correlation with the peak intensity and longitudinal wave velocity. The mechanical damage law of water-bearing tar-rich coal under microwave action is revealed, which aims to solve the problem of weakening and reducing impact of hard coal on site to a certain extent, ensure the safety of working face and improve the mining efficiency of tar-rich coal. It provides basic theoretical support for microwave-assisted hydraulic fracturing technology and effective weakening measures for hard roof treatment.
Cooperative vs. Non-cooperative R&amp;D under Uncertain Probability of Success*
Authors: Chatterjee Rittwik , Kabiraj Tarun 
Published: June 2023

Abstract
R&D decision of a firm involves various sources of incomplete information. The present paper introduces incomplete information about the success probability of R&D in a model of two firms interacting in R&D and production and discusses the choice between cooperative and non-cooperative research. We consider research joint venture as the form of R&D cooperation. While the choice depends on the constellation of parameters, the following results are derived, in general. First, the high type firm always has a larger incentive for both cooperative and non-cooperative R&D compared to the low type firm. Second, if the low type firm goes for non-cooperative research, then the high type firm must go for the same, and if the high type firm prefers cooperative research, the low type firm must also prefer cooperative R&D. However, if the high type firm prefers non-cooperative R&D, the low type firm may go for either form of research depending on the parameters. The paper derives conditions, in particular, for the case when the high type firm prefers non-cooperative research whereas the low type firm prefers cooperative research.
Temperature Rise Characteristics of Permanent Magnet Synchronous Motor Considering Boiling Heat Transfer
Authors: He Liange , Feng Yuhang , Zhang Yan , Guo Dong , Qin Zhaoju 
Published: June 2023

Abstract
The temperature rise characteristics of PMSM (permanent magnet synchronous motor) during operation were studied under the condition of BHT (boiling heat transfer) in cooling water. The subcooling boiling heat transfer model, RPI (Rensselaer polytechnic institute), was used to calculate and improve the computational accuracy of simulation results. The experiments have shown that, when the motor was tested and simulated after preheating, the temperature rise characteristics were similar to test data because the boiling heat transfer phenomenon of the motor was taken into account, with an error of 1.7%, which was more accurate than the error of 7.5% without boiling. Therefore, from the results obtained from the experiments, the phenomenon of boiling heat transfer in cooling system has a significant effect on the temperature rise characteristic of the motor, which should be regarded as an important factor. Due to the influence of two-phase flow boiling heat transfer, the temperature rise of the motor in the plain areas is 4–5 ℃ higher than that in the high altitude areas, Consequently, if the motor is operated in high altitude areas, its temperature rise characteristic has better effect compared with plain area. Additionally, when BHT in cooling water is considered, the temperature of the motor drops as the rate of flow increases. In the meantime, the temperature difference between the minimum flow rate and the maximum flow rate is about 1 ℃, which means that the increase of rate of flow can enhance the boiling heat transfer effect.
Association between circulating alanine and cancer susceptibility using Mendelian randomization
Authors: Cai Qi , Liu Xiwen , Lin Lixuan , He Miao , Zhan Shuting , Liu Huiting , Huang Linchong , Liang Wenhua , He Jianxing 
Published: June 2023

Abstract

Background
Circulating alanine concentrations are associated with several cancers, but little is known about the causal direction of the associations. This study aims to explore whether there is a relationship between circulating alanine and ten common cancers.
Methods
We conducted two-sample Mendelian randomization (MR) analysis to assess the causal effects of circulating alanine on ten common cancers. According to published genome-wide association studies (GWASs), we obtained 36 alanine-related single nucleotide polymorphisms used as instrumental variables. For exposure data, genetic association data of lung, breast, pancreatic, liver, colorectal, esophageal, stomach, thyroid, prostate and ovarian cancer from GWAS Consortia were used, including up to 1,213,351 participants of European origin and 196,187 participants of East Asian. The inverse variance weighting (IVW) method was used for MR analysis, and MR-Egger and the weighted median method further evaluated the pleiotropic effect.
Results
Specific to cancer GWAS, we found that circulating alanine was significantly associated with increased squamous cell lung cancer (odds ratio [OR]: 1.37, 95% CI = 1.00-1.87; P = 0.048), pancreatic cancer (OR 3.02, 95% CI = 1.35 to 6.76; P = 0.007), low grade serous ovarian cancer (OR 1.81, 95% CI = 1.01 to 3.25; P = 0.047). We have no evidence of a convincing causal effect of circulating alanine concentrations predicted by genetics on other cancer risks.
Conclusion
We observed the possible causal relationship between circulating alanine and lung squamous cell carcinoma, pancreatic cancer, low-grade serial ovarian cancer. Further research is needed to verify this causal relationship.
Mechanical properties and constitutive modeling of 6063-T5 aluminum alloy over a wide range of strain rates and temperatures
Authors: Wang Xin , Jiang Tao , Ji Chong , Zhao Changxiao , Wang Yuting , Gao Zhenru 
Published: June 2023

Abstract
In the present study, the stress-strain relationship of 6063-T5 aluminum alloy over wide ranges of temperatures and strain rates was investigated. Firstly, the quasi-static tensile tests and high temperature split Hopkinson pressure bar (SHPB) tests were carried out for 6063-T5 aluminum alloy. In the tests, the experimental temperature ranged from room temperature to 350℃, and the dynamic strain rate was 500/s-6000/s. Secondly, the effects of temperature and strain rate on mechanical properties of materials were discussed. The results showed that 6063-T5 aluminum alloy had obvious temperature softening effect and strain rate hardening effect, but strain rate softening effect may also occur under certain temperature conditions. Thirdly, the fracture morphology of tensile specimen and the metallographic structure of dynamic compression specimen under different temperature and strain rates were analyzed. Finally, by improving the fitting method and constitutive model, the modified Johnson-Cook constitutive model for 6063-T5 aluminum alloy was obtained. Compared with the traditional one, the modified Johnson-Cook constitutive model can predict the mechanical behavior of 6063-T5 aluminum alloy more accurately under high temperature and dynamic conditions.
Effect of Different Fetal Spine Positions During Early Labour on Maternal Comfort and Birth Outcomes
Authors: Rahman Nafila Abdul , Zon Erinna Mohamad , Ismail Engku Husna Engku , Abdullah Nik Ahmad Nik , Mohammad Wan Mohd Zahiruddin Wan , Lah Nik Ahmad Zuky Nik 
Published: June 2023

Abstract
Background
This study aimed to determine the maternal preferred lateralization position at the latent phase and the effect of maternal lateralization-fetal spine concordance during the active phase of the first stage of labor on maternal comfort.
Methods
This prospective cohort study involved pregnant women, who attended to labor room at Hospital Raja Perempuan Zainab II with singleton pregnancies in the first stage of labor at 37 weeks of gestation and beyond. They were recruited after fulfilling the criteria selection. Fetal occiput and spine position was confirmed by transabdominal ultrasound examination, and the maternal preference position at the latent phase of the first stage of labor was identified. Participants were randomly assigned to one of two maternal position groups: same lateralization with the fetal spine (n = 180) and opposite to the fetal spine (n = 180). The maternal mean comfort score was assessed during the first stage of labor. Secondary outcome measures (labor duration, pain relief, cardiotocography (CTG) reactivity, and fetal condition at birth) were recorded. The results were analyzed using descriptive statistics, chi-square test (categorical variables), and t-test (numerical variables to evaluate differences while kappa statistics to show agreement between groups)
Results
The preferred maternal position at the latent phase of labor was associated with the same maternal lateralization-fetal spine concordance (p < 0.001). Higher means comfort score in the same lateral position of the mother and fetal spine during the active phase of the first stage of labor but the difference is not significant. A significant association between maternal position and fetal well-being based on cardiotocography (CTG) tracing with the same position having more cases of normal CTG tracing. Duration of labor, mode of delivery, the requirement of analgesia, and Apgar score were not associated with lateralization of the mother and fetal spine position during labor.
Conclusion
Parturients preferred lying in concordant with the fetal spine lateralization position at the latent phase of the first stage of labor and they were also more comfortable in that position during the active phase of labor with reassuring fetal well-being on CTG tracing.
Characterization of 3-dimensional almost contact metric structures
Authors: Gherici Beldjilali 
Published: June 2023

Abstract
The aim of this paper is two-fold. First, a new characterization of any three-dimensional almost contact metric structure is obtained. Second, the necessary and sufficient condition for these structures to be integrable is determined, and an equivalent condition is given in terms of ∇ξ. Illustrative examples are given.
Phytochemical screening and in vitro assessments of antioxidant and cytotoxic potentials of extracts from Aesculus hippocastanum L. green fruit mesocarps
Authors: AŞKIN ÇELİK Tülay , ASLANTÜRK Özlem Sultan 
Published: June 2023

In this study, the in vitro antioxidant and cytotoxic effects of water and methanol extracts obtained from the green fruit mesocarp of Aesculus hippocastanum L. (Hippocastanaceae) were investigated. Phytochemical content of the methanol extract and the water extract were determined by qualitative methods; antioxidant activity was determined by DPPH free radical scavenging test, and total antioxidant capacity was determined by phosphomolybdate test. The effects of the extracts on proliferation and cell viability of BJ normal human foreskin fibroblasts were also evaluated by the WST-8 cell viability test.
Qualitative phytochemical screening results showed that the methanol extract contains phenols, tannins, flavonoids, and saponins, but no alkaloids and anthraquinones. On the other hand, phenols, flavonoids, anthraquinone, and saponins were found in the water extract, tannins and alkaloids could not be detected.
In addition, an increase in antioxidant activity was also observed with each increasing concentration of methanol and water extract. When the antioxidant capacity and free radical scavenging activity of methanol and water extracts were compared, it was determined that the methanol extract was more effective than that the water extract. The WST-8 trial results showed that both water and methanol extracts obtained from the green fruit mesocarp of A. hippocastanum did not have cytotoxic effects on BJ cells, on the contrary, treatment concentrations of 10, 20 and, 30 µgmL-1 increased cell proliferation significantly at the 24-hour work.
Re-naturing cities through water-centric development: evaluating a canal restoration project in Narayanganj City, Bangladesh
Authors: Chowdhooree Imon , Aziz Tasfin 
Published: June 2023

AbstractThe concept of ‘re-naturing cities’ promotes nature-based solutions for sustainable urban design; one of those being water-centric development with networks of blue (water bodies) and green (vegetation areas) aims to generate urban areas that support economic growth, strengthen social cohesion, and restore degraded ecosystems. Projects get implemented for revitalizing urban water bodies with multifunctional areas. This context demands to study water-centric development projects for evaluating the success of ‘re-naturing cities’ in terms of achieving sustainable goals. This research analyzes a part of a canal restoration project of Narayanganj City, Bangladesh, for investigating the development process and understanding its effectiveness in achieving sustainable goals. The study employs multiple qualitative tools for capturing users' views (emic analysis) and researchers' views (etic analysis). The combined understanding identifies that the project focuses primarily on adding an aesthetically pleasing element to the urban fabric, overlooking multiple socioeconomic and ecological possibilities of living with water.