Modularization of multi-qubit controlled phase gate and its NMR implementation

Quantum circuit network is a set of circuits that implements a certain computation task. Being at the center of the quantum circuit network, the multi-qubit controlled phase shift is one of the most important quantum gates. In this paper, we apply the method of modular structuring in classical computer architecture to quantum computer and give a recursive realization of the multi-qubit phase gate. This realization of the controlled phase shift gate is convenient in realizing certain quantum algorithms. We have experimentally implemented this modularized multi-qubit controlled phase gate in a three qubit nuclear magnetic resonance quantum system. The network is demonstrated experimentally using line selective pulses in nuclear magnetic resonance technique. The procedure has the advantage of being simple and easy to implement.Comment: to appear in Journal of Optics B: Quantum and Semiclassical Optic

Initialization of nanowire or cluster growth critically controlled by the effective V/III ratio at the early nucleation stage

For self-catalyzed nanowires (NWs), reports on how the catalytic droplet initiates successful NW growth are still lacking, making it difficult to control the yield and often accompanying a high density of clusters. Here, we have performed a systematic study on this issue, which reveals that the effective V/III ratio at the initial growth stage is a critical factor that governs the NW growth yield. To initiate NW growth, the ratio should be high enough to allow the nucleation to extend to the entire contact area between the droplet and substrate, which can elevate the droplet off of the substrate, but it should not be too high in order to keep the droplet. This study also reveals that the cluster growth between NWs is also initiated from large droplets. This study provides a new angle from the growth condition to explain the cluster formation mechanism, which can guide high-yield NW growth

JIT-Compiler-Assisted Distributed Java Virtual Machine

There is now a strong interest in high-performance execution of multithreaded Java programs in a cluster. Previous efforts to provide for such executions have either used static compilation tools that can transform multithreaded Java programs into parallel versions, or interpreter-based cluster-aware JVMs that offer the needed support. They failed however to be fully compliant with the Java language specification or to achieve high performance due to their weaknesses in supporting thread distribution and global object sharing. We present our research experience in the design and implementation a JIT-compiler-assisted distributed Java Virtual Machine. In our system, we make use of a JIT compiler to realize and optimize dynamic thread migration and global object sharing in a distributed environment. 1

High-Performance Computing on Clusters: The Distributed JVM Approach

this memory model. Before a thread releases a lock, it must copy all assigned values in its private working memory back to the heap which is shared by all threads. Before a thread acquires a lock, it must flush (invalidate) all variables in its working memory; and later uses will load the values from the hea

A Novel Adaptive Home Migration Protocol in Home-based DSM

Home migration is used to tackle the home assignment problem in home-based software distributed shared memory systems. We propose an adaptive home migration protocol to optimize the single-writer pattern which occurs frequently in distributed applications. Our approach is unique in its use of a per-object threshold which is continuously adjusted to facilitate home migration decisions. This adaptive threshold is monotonously decreasing with increased likelihood that a particular object exhibits a lasting single-writer pattern. The threshold is tuned according to the feedback of previous home migration decisions at runtime. We implement this new adaptive home migration protocol in a distributed Java Virtual Machine that supports truly parallel execution of multi-threaded Java applications on clusters. The analysis and the experiments show that our new home migration protocol demonstrates both the sensitivity to the lasting single-writer pattern and the robustness against the transient single-writer pattern. In the latter case, the protocol inhibits home migration in order to reduce the home redirection overhead

Influence of Na+ ion doping on the phase change and upconversion emissions of the GdF3: Yb3+, Tm3+ nanocrystals obtained from the designed molecular precursors

SSCI-VIDE+CARE:CDFA+HAY:WFA:SMR:JZH:SDAInternational audienc

Salvianolic Acid B Inhibited PPARγ Expression and Attenuated Weight Gain in Mice with High-Fat Diet-Induced Obesity

Background/Aims: Obesity contributes to the development of cardiometabolic disorders such as type 2 diabetes, fatty liver disease and cardiovascular disease. Salvianolic acid B (Sal B) is a molecule derived from the root of Salvia miltiorrhiza (Danshen), which is a traditional Chinese medicine that is widely used to treat cardiovascular diseases. However, the role of Sal B in obesity and obesity-related metabolic disorders is unknown. In this study, we aimed to investigate the effects of Sal B on high-fat diet-induced obesity and determine the possible mechanisms involved. Methods: Male C57BL/6J mice fed a high-fat diet for 12 weeks received a supplement of Sal B (100 mg/kg/day) by gavage for a further 8 weeks. These mice were compared to control mice fed an un-supplemented high-fat diet. 3T3-L1 preadipocytes were used in vitro studies. Results: Sal B administration significantly decreased body weight, white adipose tissue weight, adipocyte size and lipid (triglyceride and total cholesterol) levels in obese mice. Eight weeks of Sal B administration also improved the intraperitoneal glucose tolerance test (IPGTT) and intraperitoneal insulin tolerance test (IPITT) scores in high-fat diet-induced obese mice. In 3T3-L1 preadipocytes that were cultured in vitro and induced to differentiate, Sal B reduced the accumulation of lipid droplets and lipid content in a dose-dependent manner. Immunoblotting indicated that Sal B decreased peroxisome proliferator-activated receptor gamma (PPARγ) and CCAAT/enhancer binding protein α (C/EBPα) expression but increased the expression of GATA binding protein 2 and 3 (GATA 2, GATA 3) both in vivo and in vitro. Conclusion: Our data suggest that Sal B may reduce obesity and obesity-related metabolic disorders by suppressing adipogenesis. The effects of Sal B in adipose tissue may be related to its action on PPARγ, C/EBPα, GATA-2 and GATA-3

Zn-Assisted TiO_2–<i>x</i> Photocatalyst with Efficient Charge Separation for Enhanced Photocatalytic Activities

A new Zn-assisted method has been employed to synthesize reduced TiO₂(TiO_2–<i>x</i>) photocatalyst via a one-step hydrothermal process. In order to prevent the oxidation of TiO_2–<i>x</i> in air, hydrofluoric acid is introduced in the preparative process for the stabilization of the Ti³⁺ and oxygen vacancies, as confirmed by low-temperature electron paramagnetic resonance. The obtained reduced TiO₂ presents a wide-spectrum solar light absorption, including the near-infrared region. In addition, {110}–{111} and {101}–(001) dual-facet exposures are generated by Cl- and F-based surface-terminated reagents, respectively. The generated {001} and {101} facets on reduced TiO₂ samples act as hole and electron collectors, respectively, which contributes to the charge separation of the catalyst. Finally, the synergistic effect between Ti³⁺ doping and dual-facet exposure results in the high photocatalytic performance for degradation of Rhodamine B and formic acid

Sub-second ultrafast yet programmable wet-chemical synthesis

Abstract Wet-chemical synthesis via heating bulk solution is powerful to obtain nanomaterials. However, it still suffers from limited reaction rate, controllability, and massive consumption of energy/reactants, particularly for the synthesis on specific substrates. Herein, we present an innovative wet-interfacial Joule heating (WIJH) approach to synthesize various nanomaterials in a sub-second ultrafast, programmable, and energy/reactant-saving manner. In the WIJH, Joule heat generated by the graphene film (GF) is confined at the substrate-solution interface. Accompanied by instantaneous evaporation of the solvent, the temperature is steeply improved and the precursors are concentrated, thereby synergistically accelerating and controlling the nucleation and growth of nanomaterials on the substrate. WIJH leads to a record high crystallization rate of HKUST-1 (~1.97 μm s−1), an ultralow energy cost (9.55 × 10−6 kWh cm−2) and low precursor concentrations, which are up to 5 orders of magnitude faster, −6 and −2 orders of magnitude lower than traditional methods, respectively. Moreover, WIJH could handily customize the products’ amount, size, and morphology via programming the electrified procedures. The as-prepared HKUST-1/GF enables the Joule-heating-controllable and low-energy-required capture and liberation towards CO2. This study opens up a new methodology towards the superefficient synthesis of nanomaterials and solvent-involved Joule heating