Carbon aerogel from waste corrugated cardboard: Facile preparation, characterization, and application to solar steam generation and adsorption

Yuhui Ma 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7

Carbon aerogel (CASol-Ads) was prepared from waste corrugated cardboard (WCC) by using a green andfacile strategy and it was explored as an all-in-one solar evaporator and a floatable absorbent. Thermal conversion ofcarbon precursor was investigated using thermogravimetric analyzer coupled with Fourier transform infrared spectrometer. The amorphous carbon aerogel was made up of criss-crossing carbon ribbons and it had a typical micromesoporousstructure and a specific surface area of 575m2 g1. It exhibited remarkable optical absorption over 81.8%in the UV and Vis regions and over 70% in the NIR region. The surface temperature of dry CASol-Ads can achieve77.9 oC under 1 kW m2 irradiation. The hydrophilic 3D network structure of CASol-Ads provides a large volume for thestorage of liquids; thus, the carbon aerogel was able to store as much as 13.4 times its own weight in water. Solar-drivenevaporation rate over CASol-Ads saturated with water was calculated to be 1.68 kg m2 h1, which was 4.5 times the valueachieved with bare water under 1 kW m2 irradiation. The adsorption behavior of CASol-Ads for methylene blue (MB) fittedthe Langmuir isotherm model with the maximum monolayer adsorption capacity of 108mg g1. The monolithicCASol-Ads can be used as a self-floating absorbent for the adsorption of MB from water, and the adsorption kinetics followedpseudo-second-order kinetics model.

Effects of Pluronic F68 and Labrasol on the Intestinal Absorption and Pharmacokinetics of Rifampicin in Rats

Li Ma,Xin'an Wu,Yuhui Wei,Yan Zhou,Xiaohua Ma 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.11

The aim of this study was to investigate the effects of Pluronic F68 and Labrasol on the intestinal absorption and pharmacokinetics of rifampicin. Intestinal permeability of rifampicin with or without excipients was evaluated by an in situ single-pass perfusion method. A highperformance liquid chromatographic method was applied to study the pharmacokinetics of rifampicin with or without excipients. Labrasol or Pluronic F68 (0.1% and 0.05%, v/v), co-perfused with rifampicin (60 μg/mL), significantly increased in situ permeability. Similarly, verapamil (a typical P-gp inhibitor) also increased in situ permeability, but to a lesser extent. In vivo, the oral administration of rifampicin with or without Pluronic F68, Labrasol or verapamil resulted in statistically significant effect on t1/2 (4.83 to 7.75, 6.42 and 7.46 h) and total body clearance (0.46 to 0.26, 0.28, 0.24 L/h/kg). In addition, Pluronic F68, Labrasol and verapamil produced minor changes in AUC_0-t, which improved 1.55-, 1.54-, and 1.73-fold in comparison to control group, respectively. These results showed that Labrasol and Pluronic F68 might inhibit the function of P-gp in the intestine, thereby increasing intestinal absorption and changing the pharmacokinetic parameters of rifampicin. Therefore, excipient selection is an important factor to consider in rational formulation design.

Regularization Parameter Selection for Total Variation Model Based on Local Spectral Response

Yuhui Zheng,Kai Ma,Qiqiong Yu,Jianwei Zhang,Jin Wang 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5

In the past decades, various image regularization methods have been introduced. Among them, total variationmodel has drawn much attention for the reason of its low computational complexity and well-understoodmathematical behavior. However, regularization parameter estimation of total variation model is still an openproblem. To deal with this problem, a novel adaptive regularization parameter selection scheme is proposedin this paper, by means of using the local spectral response, which has the capability of locally selecting theregularization parameters in a content-aware way and therefore adaptively adjusting the weights between thetwo terms of the total variation model. Experiment results on simulated and real noisy image show the goodperformance of our proposed method, in visual improvement and peak signal to noise ratio value.

Regularization Parameter Selection for Total Variation Model Based on Local Spectral Response

Zheng, Yuhui,Ma, Kai,Yu, Qiqiong,Zhang, Jianwei,Wang, Jin Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5

In the past decades, various image regularization methods have been introduced. Among them, total variation model has drawn much attention for the reason of its low computational complexity and well-understood mathematical behavior. However, regularization parameter estimation of total variation model is still an open problem. To deal with this problem, a novel adaptive regularization parameter selection scheme is proposed in this paper, by means of using the local spectral response, which has the capability of locally selecting the regularization parameters in a content-aware way and therefore adaptively adjusting the weights between the two terms of the total variation model. Experiment results on simulated and real noisy image show the good performance of our proposed method, in visual improvement and peak signal to noise ratio value.

A Defect Detection Algorithm of Denim Fabric Based on Cascading Feature Extraction Architecture

Shuangbao Ma,Renchao Zhang,Yujie Dong,Yuhui Feng,Guoqin Zhang 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.1

Defect detection is one of the key factors in fabric quality control. To improve the speed and accuracy of denimfabric defect detection, this paper proposes a defect detection algorithm based on cascading feature extractionarchitecture. Firstly, this paper extracts these weight parameters of the pre-trained VGG16 model on the largedataset ImageNet and uses its portability to train the defect detection classifier and the defect recognitionclassifier respectively. Secondly, retraining and adjusting partial weight parameters of the convolution layerwere retrained and adjusted from of these two training models on the high-definition fabric defect dataset. Thelast step is merging these two models to get the defect detection algorithm based on cascading architecture. Then there are two comparative experiments between this improved defect detection algorithm and otherfeature extraction methods, such as VGG16, ResNet-50, and Xception. The results of experiments show thatthe defect detection accuracy of this defect detection algorithm can reach 94.3% and the speed is also increasedby 1–3 percentage points.

Power control of CiADS core with the intensity of the proton beam

Kai Yin,Wenjing Ma,Wenjuan Cui,Zhiyong He,Xinxin Li,Shiwu Dang,Feng Yang,Yuhui Guo,Limin Duan,Meng Li,Yikai Hou 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4

This paper reports the control method for the core power of the China initiative Accelerator DrivenSystem (CiADS) facility. In the CiADS facility, an intense external neutron source provided by a protonaccelerator coupled to a spallation target is used to drive a sub-critical reactor. Without any control rodinside the sub-critical reactor, the core power is controlled by adjusting the proton beam intensity. Inorder to continuously change the beam intensity, an adjustable aperture is considered to be used at theLow Energy Beam Transport (LEBT) line of the accelerator. The aperture size is adjusted based on theProportional Integral Derivative (PID) controllers, by comparing either the setting beam intensity or thesetting core power with the measured value. To evaluate the proposed control method, a CiADS coremodel is built based on the point reactor kinetics model with six delayed neutron groups. The simulations based on the CiADS core model have indicated that the core power can be controlled stably byadjusting the aperture size. The response time in the adjustment of the core power depends mainly onthe adjustment time of the beam intensity

A Novel Sub-optimum Data Transmission Algorithm for Wireless Sensor Networks

Jin Wang,Bo Tang,Tinghuai Ma,Yuhui Zheng,Jeong-Uk Kim 보안공학연구지원센터 2012 International Journal of Hybrid Information Techno Vol.5 No.4

Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse

Ming Gao,Xiaona Wang,Changlei Xia,Na Song,Yuhui Ma,Qunhui Wang,Tianxue Yang,Shengbo Ge,Chuanfu Wu,Su Shiung Lam 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1

The behavior and characteristics of phenol adsorption by activated carbon produced from co-pyrolysis of coal tar pitch and vinasse were investigated. Coal tar pitch and vinasse (mass ratio of 1 : 3) were firstly co-pyrolyzed and carbonated at 400 oC for 2 h. The carbonized material produced was then soaked with saturated KOH solution and activated at 800 oC for 1 h to form activated carbon. Results from the phenol wastewater adsorption experiments suggest that pseudo-second-order kinetics and the Weber-Morris model could reflect the time-dependent adsorption behavior of phenol wastewater by the activated carbon, revealing that internal diffusion represents the rate-limiting procedure and dominant process to control the adsorption rate in the early stage of the adsorption. Monolayer adsorption played the key role during the phenol adsorption. The adsorption was an endothermic reaction in temperature ranging from 15 oC to 35 oC, indicating that the adsorption speed could be stimulated by the increasing temperature. This study establishes a theoretical foundation for the usage and the potential application of the activated carbon derived from coal tar pitch and vinasse in wastewater treatment.

Heart Failure Is Associated with Increased Risk of Long-Term Venous Thromboembolism

Tianyu Xu,Yuli Huang,Zuheng Liu,Yujia Bai,Zhuang Ma,Xiaoyan Cai,Yuhui Zhang,Jian Zhang 대한심장학회 2021 Korean Circulation Journal Vol.51 No.9

Background and Objectives: Venous thromboembolism (VTE), consisting of deep vein thrombosis (DVT) and pulmonary embolism (PE), is highly prevalent in in-hospital HF patients and contributes to worse prognoses. However, the risk of VTE in out-patients with HF in long-term period is controversial. This study aimed to evaluate the associations between HF and the risk of VTE in a long-term follow-up duration. Methods: We searched for studies investigating the risk of VTE, PE, and DVT in patients with HF before April 15, 2020, in PubMed, MEDLINE, and Embase databases. Cohort studies and post hoc analysis of RCTs were eligible for inclusion if they reported relative risk of VTE, DVT or PE in patients with HF in more than 3-month follow-up period. Results: We identified 31 studies that enrolled over 530,641 HF patients. Overall, patients with HF were associated with an increased risk of VTE (risk ratio [RR]=1.57, 95% confidence interval [CI]=1.34–1.84) and PE (RR=2.00, 95% CI=1.38–2.89). However, the risk of DVT was not significantly increased in HF patients (RR=1.33, 95% CI=0.67–2.63). Subgroup analysis showed that patients with chronic HF (RR=1.54, 95% CI=1.32–1.80) had a higher risk of VTE than those with acute HF (RR=0.95, 95% CI=0.68–1.32). Conclusions: In conclusion, HF was an independent risk for VTE and PE but not DVT in a long-term follow-up period. Patients with chronic HF were prone to suffer from VTE than acute HF.