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| 1 | Opportunities and Challenges in Deep Mining: A Brief Review显示文摘随着全球生活水平的提高,更多消费者进入了矿物资源市场,使得矿物资源的消耗正在迅速增长。其结果是,在21世纪为了有效应对矿物资源供应危机,地下采矿持续地向更深的水平推进。然而,深部采矿在一个需要有非常规技术以及有挑战性的环境下进行,为了克服这些挑战和实现可观的经济收益需要重大的创新性解决方案、最佳实践以及实施额外的安全标准。这些挑战包括深部采矿工程常常遇到的灾难性事件:岩爆、瓦斯突出、高的原岩和次生应力、大变形、挤压和流变岩体以及高温。本文回顾了全球深部采矿现状,指出了一些与深部采矿的岩石力学和工程地质相关的技术进展及机遇。在这些技术进展中,基于全自动化的采矿和矿物提取过程的无人工作面和无人矿山已成为21世纪的重要领域。 | Pathegama G. Ranjith Jian Zhao Minghe Ju Radhika V. S. De Silva Tharaka D. Rathnaweera Adheesha K. M. S. Bandara | 2017 | Engineering2017，3，4： | 31 |
| 2 | Visual representation and characterization of three-dimensional hydrofracturing cracks within heterogeneous rock through 3D printing and transparent models显示文摘 | Peng Liu Yang Ju Pathegama G. Ranjith Zemin Zheng Li Wang Ayai Wanniarachchi | 2016 | International Journal of Coal Science & Technology2016，3，3： | 21 |
| 3 | The role of estradiol in male reproductive function显示文摘传统地,睾丸激素和雌激素被认为分别地是男、女的性荷尔蒙。然而, estradiol,雌激素的占优势的表格,也在男性功能起一个关键作用。在人的 Estradiol 为 modulating 性欲,可勃起的功能,和精子发生是必要的。雌激素受体,以及 aromatase,把睾丸激素变换成雌激素的酶,充满大脑,阴茎,和睾丸,为性功能重要的机关。在大脑, estradiol 合成在与性唤起有关的区域被增加。在阴茎,另外,雌激素受体在神经与血管的捆附近与高集中在整个阴茎海绵体被发现。低睾丸激素和提高的雌激素独立于对方增加可勃起的机能障碍的发生。在睾丸,精子发生被雌激素在每水平调制,以 hypothalamus-pituitary-gonadal 轴开始,由 Leydig, Sertoli,和细菌房间列在后面,并且与 ductal 上皮, epididymis,和成熟精子完成。由 estradiol 的阴囊的房间的规定显示出两个一禁止并且 stimulatory 影响,显示剂量依赖者并且时间地的一曲复杂交响乐敏感调整。我们在这评论的目标是阐明到由看荷尔蒙的男性功能的 estradiol 的全面贡献在可勃起的功能,精子发生,和性欲上完成。 | Michael Schulster Aaron M Bernie Ranjith Ramasamy | 2016 | Asian Journal of Andrology2016，18，3： | 17 |
| 4 | The varicocele: diagnostic dilemmas, therapeutic challenges and future perspectives显示文摘精索静脉曲张在精索以内被定义为内部阴囊的静脉和 pampiniform venus 丛的反常膨胀。如果精液分析没从青春期的男性被获得,当另外的症状不在时,主要临床的指示由许多泌尿科医师使用了建议修理是阴囊的萎缩。精索静脉曲张可以在与损害精子引起阴囊的萎缩的一些男性导致阴囊的损坏生产和减少的 Leydig 房间工作,当在另外的男性精索静脉曲张可以看起来不引起有病的效果时。在成年的人,精索静脉曲张经常在场、通过手术可改正,还外科的修理的可测量的好处根据 Cochrane 评论是细微的。当比肥沃的人更通常发生在不肥沃的人时,仅仅,有记录精索静脉曲张的 20% 人将受不了富饶问题。在青少年发现的大多数精索静脉曲张在平淡的体格检查期间被检测,并且预言与精索静脉曲张的青春期的介绍哪个将最终在青春期或成人生活显示出减少的阴囊的功能是困难的。作为在成年人,为在青少年的精索静脉曲张的处理的支柱是外科的修正。然而,不同于成年 varicocelectomy (microsurgical 途径是最普通) ,为青春期的精索静脉曲张的处理更经常是 laparoscopic。不过,治疗的目标是在青春期、成年的病人的一样。至于病人,并且什么类型治疗,,对待开始治疗是最好的争吵遗体。这评论将介绍青春期的精索静脉曲张的病原学,诊断和治疗的当前的理解。 | Koji Chiba Ranjith Ramasamy Dolores J Lamb Larry I Lipshultz | 2016 | Asian Journal of Andrology2016，18，2： | 14 |
| 5 | 地应力对水压致裂裂纹扩展影响的数值模拟显示文摘研究岩石在渗流-应力作用下裂纹萌生、扩展的破坏机制问题,采用岩石破裂过程分析软件对不同地应力水平和含不同倾角裂纹下水压致裂裂纹扩展进行了数值模拟研究,结果表明:在内孔水压作用下,随着地应力由80 MPa逐渐减少到45 MPa时,形成的平直裂纹由垂直于水平主应力方向逐渐向偏离水平主应力的方向发展,同时周围伴随着许多随机裂纹;预制裂纹水压致裂可以看出水压是穿过预制裂纹的,该成果为石油工业提高石油开采率提供了理论基础和科学依据. | 陈庚 徐涛 唐春安 Ranjith P G | 2013 | 辽宁工程技术大学学报(自然科学版)2013，32，1： | 12 |
| 6 | Bibliometrics: tracking research impact by selecting Lhe appropriate metrics显示文摘 | Ashok Agarwal Damayanthi Durairajanayagam Sindhuja Tatagari Sandro C Esteves Avi Harlev Ralf Henkel Shubhadeep Roychoudhury Sheryl Homa Nicolas Garrido Puchalt Ranjith Ramasamy Ahmad Majzoub Kim Dao Ly Eva Tvrda Mourad Assidi Kavindra Kesai Reecha Sharma Saleem Banihani Edmund Ko Muhammad Abu-Elmagd Jaime Gosalvez Asher Bashiri | 2016 | Asian Journal of Andrology2016，18，2： | 10 |
| 7 | 未固结流砂地层采油过程中出砂情况模拟实验显示文摘为了研究未固结流砂储集层在采油过程中的出砂情况和影响出砂的主要因素,进行了不同条件下的出砂过程模拟实验。使用水洗白砂、黏土(高岭土)和蒸馏水制成未固结流砂地层模型,利用新开发的出砂模拟装置进行了模拟实验,并分析了作用于地层的拖曳力和地层胶结特征对出砂的影响。研究表明,随着拖曳力的增加,出砂速度和产油速度都加快;随着胶结物含量的增加,出砂量和产油量明显降低,甚至在胶结物含量较高的情况下出砂量几乎为零。地层压力大的油藏在开采期间由于产生了较大的拖曳力更可能出砂,而拖曳力和有效地层应力共同影响油藏的总体产油量。可以根据地层黏土含量估计出砂情况,从而通过采取适当的防砂措施尽可能减少出砂量。某些情况下油藏比气藏更容易出砂。 | PERERA M S A RANJITH P G RATHNAWEERA T D DE SILVA G P D LIU T | 2017 | 石油勘探与开发2017，44，5： | 8 |
| 8 | Robust Adaptive Gain Higher Order Sliding Mode Observer Based Control-constrained Nonlinear Model Predictive Control for Spacecraft Formation Flying显示文摘This work deals with the development of a decentralized optimal control algorithm, along with a robust observer,for the relative motion control of spacecraft in leader-follower based formation. An adaptive gain higher order sliding mode observer has been proposed to estimate the velocity as well as unmeasured disturbances from the noisy position measurements.A differentiator structure containing the Lipschitz constant and Lebesgue measurable control input, is utilized for obtaining the estimates. Adaptive tuning algorithms are derived based on Lyapunov stability theory, for updating the observer gains,which will give enough flexibility in the choice of initial estimates.Moreover, it may help to cope with unexpected state jerks. The trajectory tracking problem is formulated as a finite horizon optimal control problem, which is solved online. The control constraints are incorporated by using a nonquadratic performance functional. An adaptive update law has been derived for tuning the step size in the optimization algorithm, which may help to improve the convergence speed. Moreover, it is an attractive alternative to the heuristic choice of step size for diverse operating conditions. The disturbance as well as state estimates from the higher order sliding mode observer are utilized by the plant output prediction model, which will improve the overall performance of the controller. The nonlinear dynamics defined in leader fixed Euler-Hill frame has been considered for the present work and the reference trajectories are generated using Hill-Clohessy-Wiltshire equations of unperturbed motion. The simulation results based on rigorous perturbation analysis are presented to confirm the robustness of the proposed approach. | Ranjith Ravindranathan Nair Laxmidhar Behera | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 8 |
| 9 | CO_2 permeability of fractured coal subject to confining pressures and elevated temperature: Experiments and modeling显示文摘The CO_2 permeability of fractured coal is of great significance to both coalbed gas extraction and CO_2 storage in coal seams, but the effects of high confining pressure, high injection pressure and elevated temperature on the CO_2 permeability of fractured coal with different fracture extents have not been investigated thoroughly. In this paper, the CO_2 permeability of fractured coals sampled from a Pingdingshan coal mine in China and artificially fractured to a certain extent is investigated through undrained triaxial tests. The CO_2 permeability is measured under the confining pressure with a range of 10–25 MPa, injection pressure with a range of 6–12 MPa and elevated temperature with a range of 25–70°C. A mechanistic model is then proposed to characterize the CO_2 permeability of the fractured coals. The effects of thermal expansion, temperature-induced reduction of adsorption capacity, and thermal micro-cracking on the CO_2 permeability are explored. The test results show that the CO_2 permeability of naturally fractured coal saliently increases with increasing injection pressure. The increase of confining pressure reduces the permeability of both naturally fractured coal and secondarily fractured coal. It is also observed that initial fracturing by external loads can enhance the permeability, but further fracturing reduces the permeability. The CO_2 permeability decreases with the elevation of temperature if the temperature is lower than 44°C, but the permeability increases with temperature once the temperature is beyond 44°C. The mechanistic model well describes these compaction mechanisms induced by confining pressure, injection pressure and the complex effects induced by elevated temperature. | JU Yang WANG JianGuo WANG HuiJie ZHENG JiangTao RANJITH Pathegama G GAO Feng | 2016 | Science China(Technological Sciences)2016，59，12： | 8 |
| 10 | 微量陨石激光熔样稀有气体测定方法显示文摘微量陨石激光熔样稀有气体测定方法是一种可以在微米尺度上对几毫克陨石样品进行准确稀有气体同位素分析的方法,克服了传统全岩熔融法在测量时存在样品用量大、前处理过程复杂和样品稀有气体分布不均导致不同组分的宇宙射线暴露历史无法进一步区分等问题。但是由于该方法所用样品体积小和样品用量低,要求实验室具有超低本底的稀有气体提取系统,目前国内在微量陨石稀有气体分析技术方面尚处于起步阶段。本文采用金刚石激光样品窗成功研制了超低本底的气体提取系统,通过系统体积标定和天平称量误差、热本底、干扰元素、质量歧视及质谱灵敏度等参数的校正,在中国科学院地质与地球物理研究所建立了微量陨石激光熔样稀有气体测定方法,并对毫克级微量钙长辉长无球粒陨石Millbillillie粉末标样进行了稀有气体同位素含量和比值测定,计算获得准确一致的宇宙暴露年龄。该方法的建立,将为我国迅速发展的比较行星学和深空探测提供重要技术支撑。 | 王英 贺怀宇 张川统 苏菲 PADINHAREVEETIL MANCHAN Ranjith 马严 郑德文 | 2018 | 岩石学报2018，34，11： | 6 |
| 11 | 地下水中非水相流体污染运移的三维有限元法显示文摘介绍孔隙介质中二相流三维有限元的开发,此法可用于地下非溶混污染物渗流输运问题。阐述其基本原理和数值离散格式,以及采用混合形式的表达方程来解决由依赖饱和度的变量在时间演化中的较强的非线性所引起的数值逼近上的困难,说明了同步解法的有效性和改善计算效率的办法。给出2个算例以验证程序的正确性和展示其初步的可应用性。 | 李宏 RANJITH P G | 2008 | 岩石力学与工程学报2008，27，12： | 6 |
| 12 | Percutaneous embolization of varicocele: technique, indications, relative contraindications, and complications显示文摘为精索静脉曲张的处理有几种选择,也包括外科的修理由开或 microsurgical 途径, laparoscopy,或通过内部精子的静脉的经皮的 embolization。精索静脉曲张处理的最终的目标依靠排干睾丸的扩大静脉的吸藏。经皮的 embolization 提供快速的恢复和罐头成功地在约 90% 尝试被完成。然而,这种技术要求 interventional 放射线学的专家知识并且有 pampiniform 的潜在的严肃的复杂并发症,包括的脉管的穿孔,卷迁居,和血栓丛。这评论讨论与精索静脉曲张的经皮的 embolization 联系的普通指示,相对禁止徵候,技术细节,和风险。 | Joshua Halpern Sameer Mittal Keith Pereira Shivank Bhatia Ranjith Ramasamy | 2016 | Asian Journal of Andrology2016，18，2： | 5 |
| 13 | Effect of sample size on the fluid flow through a single fractured granitoid显示文摘Most of deep geological engineered structures,such as rock caverns,nuclear waste disposal repositories,metro rail tunnels,multi-layer underground parking,are constructed within hard crystalline rocks because of their high quality and low matrix permeability.In such rocks,fluid flows mainly through fractures.Quantification of fractures along with the behavior of the fluid flow through them,at different scales,becomes quite important.Earlier studies have revealed the influence of sample size on the confining stress-permeability relationship and it has been demonstrated that permeability of the fractured rock mass decreases with an increase in sample size.However,most of the researchers have employed numerical simulations to model fluid flow through the fracture/fracture network,or laboratory investigations on intact rock samples with diameter ranging between 38 mm and 45 cm and the diameter-to-length ratio of 1:2 using different experimental methods.Also,the confining stress,σ_3,has been considered to be less than 30 MPa and the effect of fracture roughness has been ignored.In the present study,an extension of the previous studies on 'laboratory simulation of flow through single fractured granite' was conducted,in which consistent fluid flow experiments were performed on cylindrical samples of granitoids of two different sizes(38 mm and 54 mm in diameters),containing a 'rough walled single fracture'.These experiments were performed under varied confining pressure(σ_3=5-40 MPa),fluid pressure(f_p ≤25 MPa),and fracture roughness.The results indicate that a nonlinear relationship exists between the discharge,Q,and the effective confining pressure,σ_(eff),and Q decreases with an increase in σ_(eff).Also,the effects of sample size and fracture roughness do not persist when σ_(eff)≥ 20 MPa.It is expected that such a study will be quite useful in correlating and extrapolating the laboratory scale investigations to in-situ scale and further improving theoretical/numerical models associated with fluid flow through rock masses. | Kunal Kumar Singh Devendra Narain Singh Ranjith Pathegama Gamage | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，3： | 5 |
| 14 | 性腺功能减退患者的生育能力保护:研究进展显示文摘越来越多的年轻人和中年人有治疗性腺功能减退症(雄激素含量缺乏相关症状)的需求,其症状包括抑郁症,性冷淡,勃起功能障碍,疲劳。然而,睾酮补充疗法(包括使用天然和合成的类固醇)引起的睾丸功能衰退的患者人数正在增加,特别是那些年轻的运动员,外源性类固醇的使用对这些人的睾丸功能产生了消极影响。外源性睾酮治疗可以影响下丘脑垂体性腺轴的自然调节,造成生精功能受损,可能会导致严重后果,例如无精子症等男性不育症。对于那些患有性腺功能减退症的育龄男性,选择治疗方法时,保护生育能力很重要。研究显示,人绒毛膜促性腺激素(HCG)不仅可以治疗那些睾酮补充疗法引起的无精子症,还有助于维持升高的睾丸内睾酮水平。此外,选择性雌激素受体调节剂常与人绒毛膜促性腺激素联合使用治疗性腺功能减退症,该疗法不仅可以提高总睾酮水平,还有助于保护这些患者的生精功能。 | Ranjith Ramasamy Joseph M Armstrong Larry I Lipshultz | 2015 | Asian Journal of Andrology2015，17，2： | 4 |
| 15 | Microsurgical epididymal sperm aspiration: indications, techniques and outcomes显示文摘Microsurgical epididymal 精子渴望(方山) 从被选择并且取样了使用一台操作显微镜提供的高力量的光放大的 epididymis 的最佳的区域指包含精子的液体的检索。检索精子随后被使用让 intracytoplasmic 精子注射(ICSI ) 导致授精和怀孕。方山被是为在有给它复杂并发症的优秀精子,优秀报导授精和怀孕率,和低风险的高收益的妨碍的精子缺乏的人的精子检索的标准答案技术的许多专家考虑。然而,方山必须在一个操作房间里被执行,要求 microsurgical 技巧并且为用 ICSI 的复制仅仅是有用的。此处我们在场为方山,过程的技术表演和被报导了的结果的候选人病人的评估的概述。 | Aaron M Bernie Ranjith Ramasamy Doron S Stember Peter J Stahl | 2013 | Asian Journal of Andrology2013，15，1： | 4 |
| 16 | 生精障碍的疗法显示文摘与继发性睾丸衰竭相比,男性生精障碍的治疗目前大都收效甚微。从激素治疗,到补充相应营养成分(抗氧化作用),很多种疗法都被尝试过了。虽然有些研究表明某些疗法有一定的效果,但是没有任何一种疗法能够对所有患者都起效,同时又无法预测该疗法能够适用于哪类患者。先天生精障碍可能由许多不同的还未被证实的精子产生方面的缺陷引起的。深入理解这些缺陷,能够帮助我们寻求更有效的治疗方案,同时能够帮助我们筛选某种疗法的适用患者群。本文着眼于综述目前男性不育激素和抗氧化疗法的基本原理和成效,特别关注生精障碍的相关疗法。尽管目前辅助生殖技术已经大大取代了生精障碍的传统医疗方法,但二者将继续齐头并进发挥作用,相互结合共同起效。 | Ranjith Ramasamy Peter J Stahl Peter N Schlegel | 2012 | Asian Journal of Andrology2012，14，1： | 3 |
| 17 | Prediction of preferential fluid flow in porous structures based on topological network models: Algorithm and experimental validation显示文摘The understanding and prediction of preferential fluid flow in porous media have attracted considerable attention in various engineering fields because of the implications of such flows in leading to a non-equilibrium fluid flow in the subsurface. In this study, a novel algorithm is proposed to predict preferential flow paths based on the topologically equivalent network of a porous structure and the flow resistance of flow paths. The equivalent flow network was constructed using Poiseuille's law and the maximal inscribed sphere algorithm. The flow resistance of each path was then determined based on Darcy's law. It was determined that fluid tends to follow paths with lower flow resistance. A computer program was developed and applied to an actual porous structure. To validate the algorithm and program, we tested and recorded two-dimensional(2 D) water flow using an ablated Perspex sheet featuring the same porous structure investigated using the analytical calculations. The results show that the measured preferential flow paths are consistent with the predictions. | JU Yang LIU Peng ZHANG DongShuang DONG JiaBin RANJITH P.G. CHANG Chun | 2018 | Science China(Technological Sciences)2018，61，8： | 2 |
| 18 | Nickel nanopore arrays as promising current collectors for constructing solid-state supercapacitors with ultrahigh rate performance显示文摘 | Huaping Zhao Long Liu Yaoguo Fang Ranjith Vellacheri Yong Lei | 2018 | Frontiers of Chemical Science and Engineering2018，12，3： | 2 |
| 19 | Recent advances in the genetics of testicular failure显示文摘不孕影响约 15% 夫妇,并且男因素为所有不孕的 30%-50% 负责。男不孕的最严重的形式是阴囊的失败,并且阴囊的失败的典型显型严重地被损害精子发生导致精子缺乏或严重 oligozoospermia。尽管阴囊的失败的病原学仍然保持糟糕理解,基因因素典型地是一个内在的原因。现代帮助繁殖技术革命化了男因素不孕的处理,允许生物父权被将另外不能成为到他们通过自然概念的孩子的父亲的许多人完成。因为基因畸形的传播的潜在的风险,因此,在男性识别基因畸形是批评的。最近,与另外的强烈研究一起,进行中的、整个染色体的途径在男不孕的基因研究逐渐地被使用了。在这评论,我们集中于阴囊的失败的遗传并且在男不孕的遗传的学习在进展上提供更改。 | Seung-Hun Song Koji Chiba Ranjith Ramasamy Dolores J Lamb | 2016 | Asian Journal of Andrology2016，18，3： | 2 |
| 20 | 多壁碳纳米管制备有机光伏电池(英文)显示文摘以芝麻油为原料,采用化学气相沉积法合成出多壁碳纳米管(MWCNTs),经功能化改性、切短后用作有机光伏太阳能电池的添加剂。该有机光伏电池以聚3-辛基噻吩为光敏分子,PCBM为激子离化剂。结果表明,添加MWCNTs与功能化且切短的fc-MWCNTs,有机光伏电池的功率转换效率能分别提高22%和40%。由于较高的空穴迁移率,激子离化后,P3OT产生空穴的收集和运输得到提高。功能化和切短的fc-MWCNTs增加了其在P3OT,PCBM中的分散性,进而提高功率转换效率。 | Samrat Paul Bijumani Rajbongshi Birinchi Bora Ranjith G Nair S K Samdarshi | 2017 | 新型炭材料2017，32，1： | 2 |
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