Effect of Oxides on Characteristics of MnS and Transverse Mechanical Properties in Commercial Al‑Killed Non‑Quenched and Tempered Steel

Jinlong Lu,Guoguang Cheng,Julong Che,Liansheng Wang,Guojian Xiong 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2

In this paper, the characteristics of tensile fractures and the typical inclusions in as-cast blooms and as-rolled bars are carefullyinvestigated to figure out the causes of different transverse tensile properties in two commercial non-quenched andtempered steels. In low Ca bearing steel (3 ppm), MgO–Al2O3 (MA) + MnS are main inclusions and MA oxides expresshigh ability for MnS heterogeneous nucleation. Consequently, the MnS inclusions in as-rolled bars are larger in size andsmaller in number, the transverse ductility is satisfied due to the high space distance between the MnS inclusions. However,the transverse ductility of high Ca bearing steel (9 ppm) is much poor because MnS inclusions are agminated in distribution,causing severe stress concentration. The calculation results show that CaO in CaO–MgO–Al2O3 oxides (CMA) wouldreact with Al and S in molten steels, suppressing the formation of MnS inclusions on surface of CMA oxides. An integratedillumination including the evolution processes of typical oxides in molten steels, the generation behaviors of MnS duringthe solidification, the deformation behaviors of sulfides and the relationship between sulfides and crack initiation have beenconducted based on observation results and thermodynamic calculation.

ENGINE SPEED REGULATION DURING GEAR SHIFT PROCESS OF TORQUE DECOUPLED HEV USING TRIPLE-STEP NONLINEAR METHOD

Jinlong Hong,Liang Lu,Bingzhao Gao,Lin Zhang,Hong Chen 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.2

For the torque decoupled hybrid electric vehicles (HEVs) equipped with automated manual transmission (AMT), the motor torque can be used to compensate for traction loss during gear shift. Thus, engine speed regulation can be used to achieve speed synchronization, and the clutch can be removed, which simplifies the overall structure of AMT. A triple-step nonlinear method is proposed in this paper to improve the engine speed tracking accuracy, which utilizes the steady-state, reference trajectory dynamics, and the tracking error information comprehensively. By the expense of the intake manifold pressure tracking performance, the developed controller can guarantee the asymptotic convergence of the engine speed tracking error. After the triple-step controller is deduced, it is verified through co-simulation between AMT HEV plant model in AMESim and controller model in Simulink. The simulation results demonstrate that the proposed controller can exert the advantages of the two control inputs: throttle opening α and spark advance deviation Δθ, and certificate the overall gear shift quality, including shift time and vehicle jerk.

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.

Circ_0000554 is identified as a cancer‑promoting circRNA in colorectal cancer by regulating the miR‑1205/LASP1 axis

Luo Jinlong,Yang Hua,Peng Xuefeng,Zhang Faqiang,Shu Shilong,Lan Ke,Tu Shengjin,Lu Kai,Cha Xiaoying 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.5

Background: Colorectal cancer (CRC) is a prevalent malignant tumor with poor prognosis. Circular RNAs (circRNAs) are key regulators in the progression of CRC. Our study aimed to disclose the role of circ_0000554 in CRC. Methods: The expression of circ_0000554, miR-1205 and LIM and SH3 protein 1 (LASP1) was measured by quantitative real-time polymerase chain reaction (qRT-PCR). Cell proliferation, invasion and migration were monitored using cell counting kit-8 (CCK-8) assay, EdU assay, transwell assay and wound healing assay respectively. The protein levels of C-myc, matrix metallopeptidase 2 (MMP-2) and LASP1 were detected by western blot. Tumor formation assay in nude mice was conducted to explore the role of circ_0000554 in vivo. The association between miR-1205 and circ_0000554 or LASP1 was identified by dual-luciferase reporter assay and RNA immunoprecipitation (RIP) assay. Results: circ_0000554 was upregulated in CRC tissues and cells, high circ_0000554 expression was significantly linked to shorter overall survival. Downregulation of circ_0000554 restrained cell growth and metastasis while promoted apoptosis in vitro, and suppressed tumorigenesis of CRC in vivo. Furthermore, mechanism study and rescue experiments confirmed miR-1205 could be sponged by circ_0000554 and its inhibitor reversed the inhibitory effect of circ_0000554 silencing on CRC progression. LASP1 was a target gene of miR-1205 and the upregulation of LASP1 overturned miR-1205-induced effects on CRC cells. Circ_0000554 could elevate LASP1 expression via interacting with miR-1205.

An Improved Website Structure Optimizing Algorithm

Mingjun Li,Mingxin Zhang,Jinlong Zheng,Ying Lu 보안공학연구지원센터 2013 International Journal of Smart Home Vol.7 No.3

Characteristics and Formation Mechanism of Duplex (Ca,Mn)S Inclusions in Commercial Ca-Treated Resulfurized Steel

Yao Li,Guoguang Cheng,Jinlong Lu,Hu Long 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4

In this paper, in order to identify the formation mechanism of duplex (Ca,Mn)S inclusions in steel, based on the two heats ofcommercial Ca-treated resulfurized steel, the characteristics of duplex (Ca,Mn)S inclusions in bars, blooms and CaO-Al2O3oxides in molten steel were observed and analyzed. The results indicate that there are three types of duplex (Ca,Mn)S inclusionsin steel. The first type with over 20% Ca in (Ca,Mn)S is named as “Type-C”, the second with 4–20% Ca in (Ca,Mn)Sis named as “Type-MC” and the third with below 4% Ca in (Ca,Mn)S is named as “Type-M”. Their core oxides are mainlyCa-Mg–Al-O oxides. The aspect ratios of duplex (Ca,Mn)S inclusions in bars decrease as Ca content in (Ca,Mn)S increases. From Type-M to Type-C, CaO content in core oxides increases, and Ca content in wrapping (Ca,Mn)S increases. The shapeof duplex (Ca,Mn)S inclusions can be controlled through controlling CaO content in core oxides. During solidification,CaO-Al2O3 oxides become as heterogeneous nucleation cores of MnS inclusions, duplex (Ca,Mn)S inclusions forming inthis way, and Ca in wrapping (Ca,Mn)S come from CaO in core oxides. The higher CaO content in core oxides, the higherCa content in wrapping (Ca,Mn)S. Under the condition with specific Ca/S ratio in steel, to obtain more duplex (Ca,Mn)Sinclusions, numbers of Type-C should be decreased, and numbers of Type-MC and Type-M should be increased. To achievethis goal, the key is to obtain larger numbers of CaO-Al2O3 oxides with lower CaO and smaller sizes in molten steel.

Study for Improvement of Laser Induced Damage of 1064 nm AR Coatings in Nanosecond Pulse

Hongfei Jiao,Xinbing Cheng,Jiangtao Lu,Ganghua Bao,Jinlong Zhang,Bin Ma,Huasong Liu,Zhanshan Wang 한국광학회 2013 Current Optics and Photonics Vol.17 No.1

For the conventionally polished fused silica substrate, an around 100 nm depth redeposition polishing layer was formed on the top of surface. Polishing compounds, densely embedded in the redeposition polishing layer were the dominant factor that limited the laser induced damage threshold (LIDT) of transmission elements in nanosecond laser systems. Chemical etching, super-precise polishing and ion beam etching were employed in different ways to eliminate these absorbers from the substrate. After that,Antireflection (AR) coatings were deposited on these substrates in the same batch and then tested by 1064nm nano-pulse laser. It was found that among these techniques only the ion beam etching method, which can effectively remove the polishing compound and did not induce extra absorbers during the disposal process, can successfully improve the LIDT of AR coatings.