IMECH-IRCommunity: 微重力重点实验室<p><span style="color:#4f81bd; font-family:楷体_GB2312; font-size:11pt"><span style="color:#003366; font-family:楷体,arial,helvetica,sans-serif; font-size:medium"><strong>本研究单元收录<a href="http://nml.imech.ac.cn/" target="_blank"><span style="color:#800000">中科院微重力重点实验室</span></a>全体科研人员及研究生自2009年至今的知识产出。包括公开发表的期刊论文、会议论文,报告,学位论文,专利、获奖成果以及专著和会议文集。国家微重力实验室目前的研究领域涉及微重力科学的主要方向,包括微重力流体物理,微重力燃烧科学,空间材料科学,空间生物技术与生命科学,在流体物理、燃烧、生物力学和先进诊断技术,以及与材料科学和生命科学的交叉与融合等领域开展了有特色的创新性研究工作。</strong></span></span></p>http://dspace.imech.ac.cn:80/handle/311007/265212024-03-29T01:49:44Z2024-03-29T01:49:44ZReal-time structural signatures of protein allostery by electrically- and mechanically-coupled sensing张明焜郑植周瑾丁奇寒龙勉吕守芹http://dspace.imech.ac.cn:80/handle/311007/944752024-03-25T10:00:54Z2024-03-25T10:00:54ZTitle: Real-time structural signatures of protein allostery by electrically- and mechanically-coupled sensing
Authors: 张明焜; 郑植; 周瑾; 丁奇寒; 龙勉; 吕守芹2024-03-25T10:00:54ZProfiles of free Surfaces in Revolved Containers Under Microgravity陈舒扬段俐Li, Wen陈上通康琦http://dspace.imech.ac.cn:80/handle/311007/944732024-03-25T10:00:52Z2024-03-25T10:00:52ZTitle: Profiles of free Surfaces in Revolved Containers Under Microgravity
Authors: 陈舒扬; 段俐; Li, Wen; 陈上通; 康琦2024-03-25T10:00:52ZReal-time structural signatures of protein allostery by electrically- and mechanically-coupled sensing张明焜郑植周瑾丁奇寒龙勉吕守芹http://dspace.imech.ac.cn:80/handle/311007/944632024-03-25T09:56:12Z2024-03-25T09:56:12ZTitle: Real-time structural signatures of protein allostery by electrically- and mechanically-coupled sensing
Authors: 张明焜; 郑植; 周瑾; 丁奇寒; 龙勉; 吕守芹2024-03-25T09:56:12ZProfiles of free Surfaces in Revolved Containers Under Microgravity陈舒扬段俐Li, Wen陈上通康琦http://dspace.imech.ac.cn:80/handle/311007/944612024-03-25T09:56:09Z2024-03-25T09:56:09ZTitle: Profiles of free Surfaces in Revolved Containers Under Microgravity
Authors: 陈舒扬; 段俐; Li, Wen; 陈上通; 康琦2024-03-25T09:56:09ZProfiles of free Surfaces in Revolved Containers Under MicrogravityChen, ShuyangDuan, LiLi, WenChen, ShangtongKang, Qihttp://dspace.imech.ac.cn:80/handle/311007/944402024-03-25T09:08:51Z2024-03-25T09:08:51ZTitle: Profiles of free Surfaces in Revolved Containers Under Microgravity
Authors: Chen, Shuyang; Duan, Li; Li, Wen; Chen, Shangtong; Kang, Qi
Description: Nowadays a propellant residual gauging method based on the thermal response of the tanks' wall is developed. And the liquid distribution and meniscus height have great effects on the thermal response. Profiles of liquid free surfaces in revolved containers under microgravity are studied through theoretical analysis and numerical simulation in this paper. The analytical formula for the static profile of the liquid surface in the spherical tank is established. It shows that the profile is a section of a circle cut off by the tank wall. For given the geometry of the tank, liquid volume and contact angle, the profile of the free surfaces under microgravity can be obtained by using the Shooting method based on the theoretical model. Numerical simulation is carried out with the Volume of Fluid method, and it is verified that the static profiles at different contact angles and liquid filling rates fit the theoretical descriptions. It is concluded that the meniscus height increases slowly as the filling rate increases, and the smaller the contact angle, the more obvious this trend. Then the theory is extended to the tanks of arbitrary shapes, and the critical position of the profile is derived. Below the critical position the propellant may accumulate in some corners or pits, which makes it unable to be fully utilized. The critical position is related to the shape of the tank and the contact angle. This research is of great value for the prediction of the static profiles of liquid surfaces in tanks and the propellant residual gauging.2024-03-25T09:08:51ZReal-time structural signatures of protein allostery by electrically- and mechanically-coupled sensingZhang, MingkunZheng, ZhiZhou, JinDing, QihanLong, MianLue, Shouqinhttp://dspace.imech.ac.cn:80/handle/311007/944222024-03-25T09:08:40Z2024-03-25T09:08:40ZTitle: Real-time structural signatures of protein allostery by electrically- and mechanically-coupled sensing
Authors: Zhang, Mingkun; Zheng, Zhi; Zhou, Jin; Ding, Qihan; Long, Mian; Lue, Shouqin
Description: Accurate detection and identification of conformational evolutions are essential to describe the micro-structural mechanisms of protein allostery. Here we establish an approach by integrating nanopore sensing technique with atomic force microscopy, based on molecular dynamics simulations. A theoretical method is further developed to real-time estimate the low-resolution structures of those evolved conformations. Tests for the forced allostery of alpha X beta 2 integrin, a typical protein with multiple functional states, demonstrate that the spheroidal shape identifiers of those intermediate conformers present sufficient sensitivity to resolve two allosteric patterns of alpha X beta 2 from bent-down to stand-up states under the nanopore confinement. The strong steric confinement from the nanopore restricts the geometric displacements of key domains in conformational extension dynamics, thereby increasing the intramolecular interaction energy barrier to be overcome for standing. Prolongation of the neck-shoulder region of alpha X beta 2 and opening at the thigh-calf joint form a competitive compensation for the stretched height, resulting in two tendentious allosteric patterns under various confined diameters and steered speeds. Thus, this study proposes a new method to real-time visualize the conformational dynamics during protein allostery, favoring to depict structural characteristics for the conformations of those transient states and evaluate the impacts of the nanopore confinement on protein allostery.2024-03-25T09:08:40ZMagnetic field recovery technique based on distance weighting multipole expansion methodLiu, BinbinYang, ZhenQiang, LiEPeng, XiaodongMa, Xiaoshan徐鹏罗子人Tang, WenlinZhang, YuzhuGao, Chenhttp://dspace.imech.ac.cn:80/handle/311007/943762024-03-14T07:45:04Z2024-03-11T08:05:15ZTitle: Magnetic field recovery technique based on distance weighting multipole expansion method
Authors: Liu, Binbin; Yang, Zhen; Qiang, LiE; Peng, Xiaodong; Ma, Xiaoshan; 徐鹏; 罗子人; Tang, Wenlin; Zhang, Yuzhu; Gao, Chen
Description: - A space-borne gravitational wave detector requires the test mass (TM) to be in an ultra-low disturbance state. However, magnetic field fluctuations will disturb the TM and produce acceleration noise. To assess the influence of the magnetic field on the TM, it is necessary to monitor and reconstruct the magnetic field near the TM in real time. In this paper, a distance weighting multipole expansion (DWME) method was proposed, and its magnetic field reconstruction accuracy was analyzed. The results demonstrated that the proposed DWME method significantly improved the reconstruction precision compared to traditional methods. It reduced the average reconstruction error of the sensitive axial magnetic field from 1.2% to 0.8% and the maximum error from 16% to 8%. In the in-orbit situation, the DWME method also outperforms traditional methods.2024-03-11T08:05:15ZAdvancing space-based gravitational wave astronomy: Rapid parameter estimation via normalizing flows杜明辉Liang, BoWang, He徐鹏罗子人Wu, Yuelianghttp://dspace.imech.ac.cn:80/handle/311007/943582024-03-14T07:45:12Z2024-03-11T08:05:03ZTitle: Advancing space-based gravitational wave astronomy: Rapid parameter estimation via normalizing flows
Authors: 杜明辉; Liang, Bo; Wang, He; 徐鹏; 罗子人; Wu, Yueliang
Description: Gravitational wave (GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries (MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion noise. Addressing this gap, we utilize scalable normalizing flow models to achieve rapid and accurate inference within the Taiji environment. Innovatively, our approach simplifies the data's complexity, employs a transformation mapping to overcome the year-period time-dependent response function, and unveils additional multimodality in the arrival time parameter. Our method estimates MBHBs several orders of magnitude faster than conventional techniques, maintaining high accuracy even in complex backgrounds. These findings significantly enhance the efficiency of GW data analysis, paving the way for rapid detection and alerting systems and enriching our ability to explore the universe through space-based GW observation.2024-03-11T08:05:03ZA measurement of Hubble constant using cosmographic approach combining fast radio bursts and supernovaeGao, JiazeZhou, Zhihuan杜明辉Zou, RuiHu, JianpingXu, Lixinhttp://dspace.imech.ac.cn:80/handle/311007/943372024-03-14T07:45:00Z2024-03-11T03:16:37ZTitle: A measurement of Hubble constant using cosmographic approach combining fast radio bursts and supernovae
Authors: Gao, Jiaze; Zhou, Zhihuan; 杜明辉; Zou, Rui; Hu, Jianping; Xu, Lixin
Description: The Hubble constant (H-0) is a crucial parameter in cosmology. Different cosmic observations have resulted in varying estimates results for H-0 that is the well-known H-0 tension. To address this issue, it is beneficial to use other data set to constrain H 0. In this paper, via the cosmographic approach based on the Friedman-Lemaitre-Robertson-Walker (FLRW) metric to the dispersion measure (DM) of the intergalactic medium DMIGM(z) of fast radio bursts (FRBs), we obtain the Taylor expansion of (DMIGM (z)) in terms of redshift z. Utilizing the uncalibrated type Ia supernaove (SNe Ia) and 18 localized FRBs, we give the cosmological constraints, H-0 = 65.5(-5.4)(+6.4) km s(1) (68 per cent CL), cosmological deceleration parameter q(0) = -0.50 +/- 0.20 and the jerk parameter j(0) = -0.1(-2.5)(+2.0). To demonstrate the impact of parameter degeneracies on our analysis methods, we compare the results using three different forms of fIGM(z) and two different prior distributions of Omega(b, 0). After that, we find that the uncertainty in H-0 is not significantly affected by the width of the prior interval of f(IGM) (z) and Omega(b, 0), but the mean value is influenced by the priors for f(IGM)(z) and Omega(b, 0) due to parameter degeneracies with H-0. Employing f(IGM (z)) that evolves with redshift, we obtain H-0 = 69.0(5.7)(+6.7)km s(-1) Mpc(-1). In addition, the mock analyses provide a posterior estimation of H-0 with an accuracy of 4.6 per cent and higher precision for q(0) and j(0) in the near future.2024-03-11T03:16:37ZEnergy mechanism for the instability of liquid jets with thermocapillaritySun, YuWenHu, KaiXin陈启生http://dspace.imech.ac.cn:80/handle/311007/943282024-03-14T07:45:09Z2024-03-11T03:16:31ZTitle: Energy mechanism for the instability of liquid jets with thermocapillarity
Authors: Sun, YuWen; Hu, KaiXin; 陈启生
Description: Xu and Davis [J. Fluid Mech. 161, 1-25 (1985)] examined the stability of long axisymmetric liquid jet subjected to an axial temperature gradient, finding capillary, surface-wave, and hydrodynamic modes. They showed that capillary breakup can be retarded or even suppressed for a small Prandtl number (Pr< 1) and a large Biot number (Bi >= 1). In the present work, the energy mechanism is carried out for these three kinds of flow instabilities, and the mechanism of suppressing capillary breakup is clarified. When the Reynolds number (R-B) is not large, the work done by the pressure on the free surface (P-S) is the main energy source of the capillary instability. At small Pr and large Bi, the phase difference between the radial velocity and surface deformation increases with R-B, leading to the decrease in P-S, which prevents the occurrence of capillary breakup. Meanwhile, the work done by thermocapillary force becomes the main energy source, making hydrodynamic modes unstable. The perturbation flow fields are displayed, which shows that the temperature fluctuations of three modes differ from each other.2024-03-11T03:16:31Z