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91.
Nishanta Barman Arpita Shome Saurav Kumar Priyam Mondal Karan Jain Mizuki Tenjimbayashi Uttam Manna 《Advanced functional materials》2023,33(22):2214840
Non-sticking droplets wrapped with fine hydrophobic particles, namely liquid marbles, can be transported both on solid and water pool without an undesired spill of the inner encapsulated liquid. While the stimuli-responsive release of the inner liquid in the target area is proposed, the time-programmed release is not yet achieved. Herein, the hydrophobicity of nanoclay is modulated via a catalyst-free 1,4-conjugate addition reaction to form liquid marbles. This nanoclay liquid marble is robust and stable in air but collapses on the liquid pool with a specific lifetime. The lifetime of the liquid marble can be modulated over seconds to hours scale depending on the selection of chemically modulated wettability of the nanoclay. The critical mechanism of lifetime modulation is responsible for controlling the coalescence kinetics between the water pool and inner liquid by nanoclays’ high diffusion length and chemically varied water spreading potential. The NC liquid marble's programmable lifetime to ‘time-bomb’ type drug release and cascade chemical reaction is applied—without requiring any external intervention. 相似文献
92.
Nitin K. Lautre Alakesh Manna 《The International Journal of Advanced Manufacturing Technology》2006,29(5-6):490-498
The paper presents a binary relational analysis and expert system base module for maintenance and fault diagnosis of CNC wire
EDM. The module proposes a framework of integrated maintenance and fault diagnosis system. The study explores the binary coded
matrix system, which plays an important role in prediction and diagnosis of wire electrical discharge machining (WEDM) faults
on the spot by expert guidance. In this study, 15 inputs were considered to observe eight probable causes with the help of
the forward and backward propagation algorithms. Inputs and output matrices were considered in the form of a square matrix.
To explain the fault diagnosis and to realize the importance of maintenance through advice, the detection of faults is investigated
through forward and back propagation of matrix transformation on the spot. It is an integrated backup that can be individually
focused when input and output parameter do not match. It is a time saving, knowledge acquisition, easy to maintain, and capable
of self-learning system. To verify the developed framework, 120 data sets were generated for proper analyzing of acquired
output through graphical representation. The paper also presents some of the important features of maintenance schedule and
probable causes of wire breakage with remedial actions in tabular form. The developed system can help the operators, trainees,
and manufacturing engineers in achieving trouble free machining through quick detection of faults and proper maintenance of
machines in actual practice. 相似文献
93.
Laser processing of materials 总被引:1,自引:0,他引:1
Light amplification by stimulated emission of radiation (laser) is a coherent and monochromatic beam of electromagnetic radiation
that can propagate in a straight line with negligible divergence and occur in a wide range of wave-length, energy/power and
beam-modes/configurations. As a result, lasers find wide applications in the mundane to the most sophisticated devices, in
commercial to purely scientific purposes, and in life-saving as well as life-threatening causes. In the present contribution,
we provide an overview of the application of lasers for material processing. The processes covered are broadly divided into
four major categories; namely, laser-assisted forming, joining, machining and surface engineering. Apart from briefly introducing
the fundamentals of these operations, we present an updated review of the relevant literature to highlight the recent advances
and open questions. We begin our discussion with the general applications of lasers, fundamentals of laser-matter interaction
and classification of laser material processing. A major part of the discussion focuses on laser surface engineering that
has attracted a good deal of attention from the scientific community for its technological significance and scientific challenges.
In this regard, a special mention is made about laser surface vitrification or amorphization that remains a very attractive
but unaccomplished proposition.
References in this paper have not been cited or prepared in journal format 相似文献
94.
In the last two decades, targeted protein degradation has rapidly gained popularity as a technique to eliminate disease-causing undruggable proteins. Over the years, many tools have been devised to degrade proteins by exploiting natural protein homeostasis machinery available in our body, with LYTACs being the latest to come on board. LYTACs, or lysosome-targeting chimeras, make use of the lysosome degradation pathway by recruiting proteins to lysosome-shuttling receptors located at the cell surface. LYTACs are specifically meant for the degradation of membrane-bound and extracellular proteins, which account for the products of 40 % of all protein-encoding genes. In this highlight, we describe two studies that demonstrate the scope of LYTACs and its advantages over the other protein degradation platforms. In the first study, the LYTAC utilizes the cation-independent mannose-6-phosphate receptor (CI−M6PR), while the second study uses the asialoglycoprotein receptor (ASGPR) which is found only on the surface of liver cells. 相似文献
95.
Shaogao Zeng Wenyuan Dou Manna Li Dr. Yang Zhou Jiehuang Guo Nan Zhao Hong Huang Qiaoli Zhou Prof. Wenhui Hu Yanfang Ma Dr. Xin Zhao Prof. Hui Xie 《ChemMedChem》2020,15(16):1608-1617
Long-acting dipeptidyl peptidase IV inhibitors have emerged as promising molecules for interventions for type 2 diabetes. Once weekly dosing brings greater patient compliance and more stable glycemic control. Starting from our previous highly potent compound with a thienoprimidine scaffold, which is unfortunately severely hit by hepatic biotransformation, a lead compound was rapidly generated by drawing on the experience of our previously discovered long-acting compounds with pyrrolopyrimidine scaffold. With the aid of an in silico biotransformation prediction tool, (R)-2-((2-(3-aminopiperidin-1-yl)-4-oxo-6-(pyridin-3-yl)thieno[3,2-d]pyrimidin-3(4H)-yl)methyl)-4-fluorobenzonitrile was eventually generated and determined to have high potency, a fine pharmacokinetic profile, and a long-acting in vivo efficacy. 相似文献
96.
Sk Jamaluddin Subhendu K. Manna Bimalesh Giri P. V. Prakash Madduri Stuart S. P. Parkin Ajaya K. Nayak 《Advanced functional materials》2019,29(24)
Magnetic skyrmions, topologically protected chiral spin textures having potential applications in data storage, are stabilized in certain magnetic materials with broken inversion symmetry. The existence of magnetic antiskyrmions has been recently demonstrated in thin plates of a tetragonal Heusler material with D2d crystal symmetry. Here, the robust nature of the antiskyrmion phase in bulk tetragonal Mn–Pt(Pd)–Sn compounds by utilizing magnetic entropy change and AC‐susceptibility measurements is shown. It is found that the formation of the antiskyrmion phase is accompanied by a positive magnetic entropy change, which is supported by the concomitant observation of an anomaly in AC‐susceptibility measurements. Supporting these findings, no anomalies are found in AC‐susceptibility and magnetic entropy change measurements for a Mn–Pt(Pd)–Sn compound that is stabilized in the cubic phase by slight changes in chemical composition, thereby showing the robustness of the antiskyrmion phase to the D2d crystal structure. 相似文献
97.
Two chlorophyll-binding antenna proteins in the photosystem II core, CP43 and CP47, are structurally similar and are thought to have evolved from a common ancestor. Several conserved histidine residues in hydrophobic regions of CP47 have been shown to be important for photosystem II structure, function, and energy transfer. The purpose of this study was to determine whether similarly located histidine residues in CP43 function in a similar way. Three conserved histidine residues in presumed membrane-spanning regions of CP43, His40, His105, and His119, were mutated to glutamine (Q) and tyrosine (Y). The strains H105Q, H119Q, and H119Y were photoautotrophs whereas H40Q, H40Y, and H105Y were obligate photoheterotrophs. The H40Y and H105Y strains lacked detectable amounts of photosystem II reaction centers and hence could not evolve oxygen whereas H40Q retained a significant amount of photosystem II and oxygen evolution capacity. The observation that mutation of histidine residues to tyrosine has more drastic effects than mutation of these residues to glutamine is in agreement with results obtained for CP47 and suggests the involvement of these residues in chlorophyll binding. The drastic functional changes observed upon mutating His40 and His105 of CP43 are similar to those observed when mutating the corresponding histidine residues in CP47, thus suggesting that the similarity between CP43 and CP47 extends to the relative importance of functionally relevant residues. Interestingly, the His40-->Gln mutation in CP43 had significant effects on photosystem II electron transfer in that it affected the thermodynamics of Q(A)- oxidation by Q(B) and increased the charge recombination rate between Q(A)- and donor side components. This indicates that relatively minor changes in CP43 can significantly impact the properties of the photosystem II reaction center. The implications of this finding are discussed. 相似文献
98.
A new P-I-N-drain MOSFET structure has been developed with very low (near-intrinsic) doping (1015-1016 cm-3 in our case) in the channel near the source/drain ends. The new structure is more effective in reducing the peak electric field at the channel/drain junction than LDD structures, and hence results in better hot carrier suppression. Also, simulations show that the near-intrinsic region near the drain reduces the transverse electric field and gives rise to higher carrier mobility and drive current. Experimental results show that, with the new structure, the substrate current and oxide charging due to hot-carrier injection are greatly reduced 相似文献
99.
Coronary pacing has been performed to treat bradycardias occurring during percutaneous transluminal coronary angioplasty (PTCA) using an angioplasty guidewire. We describe a case of a 62-year-old man who developed ventricular tachycardia (VT) during PTCA. The tachycardia was successfully terminated by overdrive pacing via an angioplasty guidewire. 相似文献
100.