PbICl precursor solutions for all solid-state PbS quantum-dot sensitized TiO2 nanorod array solar cells using successive ionic layer adsorption and reaction method

Kai Lv,Chengwu Shi,Zhengguo Zhang,Chengfeng Ma,Qi Wang 한국물리학회 2018 Current Applied Physics Vol.18 No.6

In this work, PbICl precursor solution in N,N-dimethylformamide was successfully applied to deposit PbS quantum-dots on TiO2 nanorod arrays by successive ionic layer adsorption and reaction method (SILAR). The influence of PbI2, PbBr2, PbICl precursor solution on the morphology, crystal size and optical absorption of PbS quantum-dots was investigated and the photovoltaic performance of the corresponding solid-state PbS quantumdot sensitized TiO2 nanorod array solar cells with spiro-OMeTAD was evaluated. The average crystal sizes of PbS quantum-dots were 9.0 nm of PbI2, 8.6 nm of PbBr2 and 8.4 nm of PbICl and the photoelectric conversion efficiency of the corresponding solar cells achieved 2.63%, 3.00%, 3.45%. The result revealed that PbICl precursor solution was superior to PbBr2 and PbI2.

A facile two-step preparation of compact and crystalline Sb2S3 thin film for efficient solar cells

Wu Di,Wu Yu,Wang Yanqing,Lv Kai,Shi Chengwu 한국물리학회 2021 Current Applied Physics Vol.29 No.-

The two-step preparation of compact and crystalline Sb2S3 thin films was firstly reported using the pyrolysis of the Sb-butyldithiocarbamate complex solution in DMF. The porous and amorphous Sb2S3 thin films were successfully prepared at 170 ◦C for 30 min, and then can be converted to compact and crystalline Sb2S3 thin films at 200 ◦C for 30 min or 300 ◦C for 2 min. The corresponding solar cells with the architecture of FTO/TiO2 compact layer/Sb2S3/spiro-OMeTAD/Au achieved the photoelectric conversion efficiency of 4.16% at 200 ◦C and 5.05% at 300 ◦C. The two-step preparation of the compact and crystalline Sb2S3 thin films can provide the feasible approach for the fabrication of various microstructure thin film solar cells and the low preparation temperature of 200 ◦C was also attractive to assemble the flexible Sb2S3 thin film solar cells.

Effect of six sugars on the longevity, oviposition performance and nutrition accumulation in an endoparasitoid, Meteorus pulchricornis (Hymenoptera: Braconidae)

Sheng Sheng,Xiaorui Zhang,Yu Zheng,Jiao Wang,Yu Zhou,Chengwu Liao,Jun Wang,Fu-an Wu 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1

The effects of six sugar resources (fructose, glucose, sucrose, trehalose, raffinose and honey) on the longevity, oviposition performance and nutrition levels of Meteorus pulchricornis, a thelytokous larval endoparasitoid of the common cutworm Spodoptera litura were examined under laboratory conditions. Female adults of M. pulchricornis fed 1 M fructose, glucose, trehalose or sucrose solutions survived longer than those fed on other sugar solutions or water. When provided with honey or sucrose solutions, the female parasitoids laid more offspring than those fed other sugar diets or the control. The body size of offspring driven from honey-, fructose-, sucrose-, and glucose-fed females, along with water-fed group, were larger than the trehalose- and raffinose-fed females. However, the emergence rates of all offspring generated from different sugars- and water-fed females were similar. When separately given honey, sucrose or fructose, M. pulchricornis females accumulated fructose at a higher level than the other groups. Parasitoid wasps fed trehalose solution accumulated the highest level of total sugar. Glycogen levels and lipid content were highest at emergence and then decreased across all diets. In addition, females fed on trehalose had the highest level of glycogen compared to other sugar diets and water control regardless of emergency level. Females fed trehalsoe, fructose, and glucose solutions had a higher level of lipid than those fed other sugar solutions and water at life end. The outcome of this study can benefit both laboratory rearing and management interventions that improve sugar sources for the parasitoid in the field.

Effects of Acupuncture on 1-chloro-2, 4-dinitrochlorobenzene-induced Allergic Contact Dermatitis in Mice

Cuicui Chen,Xiaozhu Liu,Yinfeng Li,Huankun Liang,Kangyan Li,Jiali Li,Chengwu Cheng,Xianpan Liu,Shuhai Zhong,Laiqing Li,Yan Wang 사단법인약침학회 2017 Journal of Acupuncture & Meridian Studies Vol.10 No.4

Allergic contact dermatitis (ACD) is a chronic inflammatory skin disease. Topical corticosteroids are the first-line therapy for ACD despite their significant adverse effects. Acupuncture has been widely used in the treatment of various skin diseases, but its underlying mechanism remains unrevealed. In this study, we investigated the characteristics of acupuncture treatment based on effectiveness and mechanism. BALB/c mice received 1-chloro-2,4-dinitrobenzene (DNCB) application to build AD-like model. Results showed that acupuncture was an effective treatment method in inhibiting inflammatory conditions, serum IgE levels, and expression of proinflammatory cytokine Th2 (IL-4, IL-6), and Th2 (IL-1b, TNF-a) mRNA compared with DNCB treatment. Acupuncture treatment also inhibited nuclear factor-kB p65, phosphorylation of IkBa, and phosphorylation of occludin proteins expression. Furthermore, it could improve the expression of epidermal growth factor in both mRNA and protein levels. These results suggest that acupuncture, as an alternative therapy treatment for its no significant side effects, was effective in alleviating ACD by reducing proinflammatory cytokines and changing proteins’ expression.

Study on Polysaccharide Bonded Abrasive Tool Using Hydrothermal Gelatinisation for Green Machining of Single Crystal Sapphire

Zhe Wu,Yuying Zhang,Yong Liu,Fangli Mo,Chengwu Wang,Huizong Lu,Julong Yuan,Zhifeng Liu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.1

Aiming to green machining of single crystal sapphire, polysaccharide-bonded soft abrasive tool using hydrothermal gelatinisation method was proposed. Mechanical properties of prepared polysaccharide films show that when the weight ratio of natural polysaccharide to cross-linked polysaccharide is 1:1, the tensile strength and extension rate of the film are relatively optimal. Composition and making process of polysaccharide bonded abrasive tool was built. Samples of polysaccharide bonded soft abrasive tools were made by which the single crystal sapphire substrates were machined. It is found that by adopting guar gum as dispersion agent and hydrothermal gelatinisation, the abrasive sedimentation during making process of abrasive tool is substantially eliminated, and better abrasive holding ability is attained. XPS and Raman microscope analysis showed that material of single crystal sapphire was removed by mechano-chemical reaction with good surface integrity. Abrasive tools with abrasive to binder ratio of 4:1 presented relatively better self-sharpening and machining performance, and the material removal rate reached 0.427 μm/min. More interesting, XPS and FT-IR analyses both indicated that the polysaccharide binder dehydrated by the friction heat during machining process.

Potential Serum Markers for Monitoring the Progression of Hepatitis B Virus-Associated Chronic Hepatic Lesions to Liver Cirrhosis

( Cheng Wu ),( Lijie Liu ),( Peng Zhao ),( Dan Tang ),( Dingkang Yao ),( Liang Zhu ),( Zhiqiang Wang ) 대한소화기학회 2015 Gut and Liver Vol.9 No.5

Background/Aims: To screen for serum protein/peptide biomarkers of hepatitis B virus (HBV)-associated chronic hepatic lesions in an attempt to profile the progression of HBV-associated chronic hepatic lesions using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS) techniques. Methods: Using SELDI-TOF MS, serum protein/peptide profiles on the CM10 ProteinChip arrays were obtained from a training group including 26 HBV-associated hepatocellular carcinoma patients with liver cirrhosis (LC), 30 HBV-associated LC patients, 85 patients at different stages of liver fibrosis, and 30 asymptomatic HBV carriers. The most valuable SELDI peak for predicting the progression to LC in HBV-infected patients was identified. Results: A SELDI peak of M/Z 5805 with value for predicting LC in HBV-infected patients was found and was identified as a peptide of the C-terminal fraction of the fibrinogen a-chain precursor, isoform 1. Conclusions: The peptide of the C-terminal fraction of the fibrinogen α-chain precursor, isoform 1 with M/Z 5805, may be a serological biomarker for progression to LC in HBV-infected patients. (Gut Liver 2015;9:665-671)

A Competition-based Algorithm for Routing Discovery and Repair in Large-scale VANET

( Cheng Wu ),( Lujie Wang ),( Yiming Wang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.12

Vehicular Ad Hoc Networks (VANET) in the large-scale road section usually have typical characteristics of large number of vehicles and unevenly distribution over geographic spaces. These two inherent characteristics lead to the unsatisfactory performance of VANETs. This poor performance is mainly due to fragile communication link and low dissemination efficiency. We propose a novel routing mechanism to address the issue in the paper, which includes a competition-based routing discovery with priority metrics and a local routing repair strategy. In the routing discovery stage, the algorithm uses adaptive scheme to select a stable route by the priorities of routing metrics, which are the length of each hop, as well as the residual lifetime of each link. Comparisons of different ratios over link length and link stability further show outstanding improvements. In the routing repair process, upstream and downstream nodes also compete for the right to establish repair process and to remain as a member of the active route after repair. Our simulation results confirm the improved performance of the proposed algorithm.