Grinding Marks on Ultra-Precision Grinding Spherical and Aspheric Surfaces

Bing Chen,Bing Guo,Shichun Li,Zhaohui Deng,Qingliang Zhao 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.4

Grinding marks are regard as a great obstacle to manufacture spherical and aspheric surfaces with higher surface quality, lower energy and wastage. The scallop-height was studied for optimizing the grinding parameters firstly to reduce its effect on grinding marks. Secondly, the expression of grinding points distribution was established to characterize the grinding marks caused by the radial run-out of grinding wheel. And then, the aspheric grinding experiments of monocrystalline silicon were carried out to investigate the influence of grinding marks on surface quality. The experiments revealed that the remarkable grinding marks with patterned grinding points distribution would cause more fractures and roughness, deeper grooves, and more inhomogeneous surface quality compared with the weak grinding marks. The discriminating standard of grinding marks was established, and the grinding parameters were optimized for homogenizing the grinding points distribution by this discriminating standard to reduce the grinding marks in actual grinding process. Finally, the large size infrared lens was ground with high surface quality by the optimized grinding parameters, and the results of surface quality demonstrate that the discriminating standard was effective. This research provides references and ideas for grinding aspherical surface with high surface quality and efficiency, low energy and wastage.

PARTNER OR OPPONENTS? HOW MINDSET SHAPES CONSUMERS’ ATTITUDE TOWARD ANTHROPOMORPHIC ARTIFICIAL INTELLIGENCE SERVICE ROBOTS

Bing Han,Xun Deng,Hua Fan 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07

The use of artificial intelligence (AI) service robots is on the rise. With service frontlines gradually shifting to human–robot interactions, the question of whether AI robots should be humanlike or machinelike has emerged. While many firms use robots that resemble humans in their appearance and actions, others use machinelike robots, assuming that very humanlike robots may lead to uncanny valley effects. There is no consensus on whether the anthropomorphism of service robots facilitates or constrains consumers’ experiences. To fill this gap, this article examines when and how service companies should use anthropomorphic AI service robots.

Stiffness modeling of a family of 6-DoF parallel mechanisms with three limbs based on screw theory

Bing Liang,Hongjian Yu,Zongquan Deng,Xiaojun Yang,Hong Hu 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1

The stiffness modeling of a family of six degrees of freedom (DoF) parallel mechanisms with configurations of 3-RUPU is presented. The mobility of the mechanisms is firstly analyzed, and then the stiffness analysis and modeling of the family of mechanisms is developed by a novel screw-theory based method. The method employs screw theory as a tool for force analysis and deformation analysis. Based on the developed stiffness model, two global flexibility indices, which refer to the maximum and minimum singular values of compliance matrix, are introduced to evaluate the compliance of parallel mechanisms. Finally, a case study is presented to demonstrate the effectiveness of the method in analyzing and evaluating the stiffness behavior of the presented parallel mechanisms.

Effect of Dietary Concentrate:forage Ratios and Undegraded Dietary Protein on Nitrogen Balance and Urinary Excretion of Purine Derivatives in Dorper×thin-tailed Han Crossbred Lambs

Ma, Tao,Deng, Kai-Dong,Tu, Yan,Jiang, Cheng-Gang,Zhang, Nai-Feng,Li, Yan-Ling,Si, Bing-Wen,Lou, Can,Diao, Qi-Yu Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.2

This study aimed to investigate dietary concentrate:forage ratios (C:F) and undegraded dietary protein (UDP) on nitrogen balance and urinary excretion of purine derivatives (PD) in lambs. Four Dorper${\times}$thin-tailed Han crossbred castrated lambs with $62.3{\pm}1.9$ kg body weight at 10 months of age were randomly assigned to four dietary treatments in a $2{\times}2$ factorial arrangement of two levels of C:F (40:60 and 60:40) and two levels of UDP (35% and 50% of CP), according to a complete $4{\times}4$ Latin-square design. Each experimental period lasted for 19 d. After a 7-d adaptation period, lambs were moved into individual metabolism crates for 12 d including 7 d of adaption and 5 d of metabolism trial. During the metabolism trial, total urine was collected for 24 h and spot urine samples were also collected at different times. Urinary PD was measured using a colorimetric method and creatinine was measured using an automated analyzer. Intake of dry matter (DM) (p<0.01) and organic matter (OM) (p<0.01) increased as the level of UDP decreased. Fecal N was not affected by dietary treatment (p>0.05) while urinary N increased as the level of UDP decreased (p<0.05), but decreased as dietary C:F increased (p<0.05). Nitrogen retention increased as dietary C:F increased (p<0.05). As dietary C:F increased, urinary excretion of PD increased (p<0.05), but was not affected by dietary UDP (p>0.05) or interaction between dietary treatments (p>0.05). Daily excretion of creatinine was not affected by dietary treatments (p<0.05), with an average value of $0.334{\times}0.005$ mmol/kg $BW^{0.75}$. A linear correlation was found between total PD excretion and PDC index ($R^2$ = 0.93). Concentrations of creatinine and PDC index in spot urine were unaffected by sampling time (p>0.05) and a good correlation was found between the PDC index (average value of three times) of spot urine and daily excretion of PD ($R^2$ = 0.88). These results suggest that for animals fed ad libitum, the PDC index in spot urine is effective to predict daily excretion of PD. In order to improve the accuracy of the spot sampling technique, an appropriate lag phase between the time of feeding and sampling should be determined so that the sampling time can coincide with the peak concentration of PD in the urine.

Calcium-Alginate-Chitosan의 스트론튬 이온 흡착 거동

Lan Dong,Bing Deng,Lan Lan Ding,Qiong Cheng,Yong Yang,Yang Du 한국고분자학회 2014 폴리머 Vol.38 No.5

Sodium alginate and chitosan are added to a CaCl2 solution to prepare calcium-alginate-chitosan and calciumalginategels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption processof the particles obtained for low concentrations of Sr2+ satisfies a second-order kinetic equation and the Freundlich adsorptionmodel. The thermodynamic behaviors of the particles indicate that adsorption occurs via a spontaneous physical process. XPS pattern analysis is used to demonstrate the adsorption of Sr2+ by calcium alginate and chitosan. By buildingan interaction model of the molecules of chitosan and alginate with Ca2+ and Sr2+ to calculate energy parameters, Fukuiindex, Mulliken charge, and Mulliken population, adsorption of Sr2+ on the molecular chains of chitosan as well as theboundary of calcium-alginate-chitosan is observed to show weak stability; by contrast, adsorption between molecularchains is high.

miR-124 Inhibits Growth and Invasion of Gastric Cancer by Targeting ROCK1

Hu, Cong-Bing,Li, Qiao-Lin,Hu, Jian-Fei,Zhang, Qiang,Xie, Jian-Ping,Deng, Li Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16

MicroRNAs (miRNAs) act as critical regulators of genes involved in many biological processes. Aberrant alteration of miRNAs have been found in many cancers, including gastric cancer (GC), but the molecular mechanisms are not well understood. Herein, we investigated the role of miR-124 in GC. We found that its expression was significantly reduced in both GC tissue samples and cell lines. Forced expression of miR-124 suppressed GC cell proliferation, migration, and invasion. Furthermore, the Rho-associated protein kinase (ROCK1) was identified as a direct target of miR-124 in GC cells. Finally, silencing of ROCK1 showed similar effects as miR-124 overexpression, while supplementation of ROCK1 remarkably restored the cell growth and invasion inhibited by miR-124. Together, our data demonstrate that miR-124 acts as a tumor suppressor by targeting ROCK1, and posit miR-124 as a novel strategy for GC treatment.

CFD simulation of an unbaffled stirred tank reactor driven by a magnetic rod: assessment of turbulence models

Li, Jiajia,Deng, Baoqing,Zhang, Bing,Shen, Xiuzhong,Kim, Chang Nyung IWA Publishing 2015 Water Science & Technology Vol.72 No.8

<P>A simulation of an unbaffled stirred tank reactor driven by a magnetic stirring rod was carried out in a moving reference frame. The free surface of unbaffled stirred tank was captured by Euler-Euler model coupled with the volume of fluid (VOF) method. The re-normalization group (RNG) k-epsilon model, large eddy simulation (LES) model and detached eddy simulation (DES) model were evaluated for simulating the flow field in the stirred tank. All turbulence models can reproduce the tangential velocity in an unbaffled stirred tank with a rotational speed of 150 rpm, 250 rpm and 400 rpm, respectively. Radial velocity is underpredicted by the three models. LES model and RNG k-epsilon model predict the better tangential velocity and axial velocity, respectively. RNG k-epsilon model is recommended for the simulation of the flow in an unbaffled stirred tank with magnetic rod due to its computational effort.</P>

Dryland agricultural environment and sustainable productivity

Gou-Xia Li,Bing-Cheng Xu,Li-Na Yin,Shi-Wen Wang,Sui-Qi Zhang,Lun Shan,곽상수,Qingbo Ke,Xi-Ping Deng 한국식물생명공학회 2020 Plant biotechnology reports Vol.14 No.2

Global climate change is expected to cause progressively increased frequency and severity of drought events, which further seriously limit plant growth and crop yields. Increasing water use effi ciency (WUE) and yield per unit rainfall are one of the most important challenges in dry land agriculture. Here, we reviewed the comprehensive technical strategies including conserving water to combine both increased agricultural productivity and resource conservation; enquiring into how crop plants respond to drought through morphological, physiological, and molecular modifi cations that occur in all plant organs; breeding for drought tolerance where there is a delineated stress environment and genotype × environment interactions are stable; eff ective conservation of rainfall and high effi ciency of use. In addition, we discussed the preponderance of biological water-saving measures, which embraces improvements in WUE and drought tolerance, by genetic improvement and physiological regulation. Sustainable agriculture would be benefi ted from modern engineering such as biological engineering, conservation tillage, and breeding technologies.

The Effect of Transformation on the Virulence of Streptococcus pneumoniae

Xue-Mei Zhang,Yi-Bing Yin,Dan Zhu,Bao-De Chen,Jin-Yong Luo,Yi-Ping Deng,Ming-Fang Liu,Shu-Hui Chen,Jiang-Ping Meng,Kai Lan,Yuan-Shuai Huang,Ge-Fei Kang 한국미생물학회 2005 The journal of microbiology Vol.43 No.4

Although pneumococcus is one of the most frequently encountered opportunistic pathogen in the world, the mechanisms responsible for its infectiveness have not yet been fully understood. In this paper, we have attempted to characterize the effects of pneumococcal transformation on the pathogenesis of the organism. We constructed three transformation-deficient pneumococcal strains, which were designated as Nos. 1d, 2d, and 22d. The construction of these altered strains was achieved via the insertion of the inactivated gene, comE, to strains 1, 2 and 22. We then conducted a comparison between the virulence of the transformation-deficient strains and that of the wild-type strains, via an evaluation of the ability of each strain to adhere to endothelial cells, and also assessed psaA mRNA expression, and the survival of hosts after bacterial challenge. Compared to what was observed with the wild-type strains, our results indicated that the ability of all of the transformation-deficient strains to adhere to the ECV304 cells had been significantly reduced (p < 0.05), the expression of psaA mRNA was reduced significantly (p < 0.05) in strains 2d and 22d, and the median survival time of mice infected with strains 1d and 2d was increased significantly after intraperitoneal bacterial challenge (p < 0.05). The results of our study also clearly indicated that transformation exerts significant effects on the virulence characteristics of S. pneumoniae, although the degree to which this effect is noted appears to depend primarily on the genetic background of the bacteria.

Rapid quantification of viable spore used in healing concrete cracks by a simple spectrophotometric method

Jinlong Zhang,Jingkun Lu,Bing Liu,Qiuyue Liu,Fan Jin,Miaojun Zhang,Yerong Liu,Yujun Song,Chenhui Dong,Wanyi Zhang,Ningxu Han,Xu Deng,Feng Xing 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.S1

Quantification of viable spores is a time taking task due to the lack of rapid, efficient and accurate methods. This studypresented a simple spectrophotometric method for the detection of viable spores based on spore’s property of losing refractivityduring the germination process. By comparison of the results obtained by both spectrophotometric method and colonycounting method, a good linear correlation (R2 = 0.99) was achieved between viable spore concentration and OD loss underappropriate conditions. To avoid interference from ungerminable spores and vegetative cells, a turbidity complementationstrategy of keeping the initial concentration of spore suspensions at the same and relatively lower level was required. Thecalibration equation developed could be used to predict the viable spore yield produced in a series of fermentation experiments. The experimental results proved that this novel spectrophotometric method was sensitive, rapid, and easy to performcompared to conventional colony counting method.