24 research outputs found
Many-objective optimization of operation strategy for district cooling system based on the per-unit value form
The operational strategy of the district cooling system (DCS) with an ice storage system must be carefully optimized for many objectives to achieve optimal operation. However, owing to the fact that the variables of DCS are in different orders of magnitude and there is a vast gap between the variables, it is not easy to perform arithmetic. In this paper, the DCS model based on the per-unit value form is formulated to develop a many-objectives operational strategy that is solved by the linear weighting method. And a multiple-attribute decision-making method is taken to get the optimal operating strategy. The simulation results are discussed for an existing cooling system with 619-node and 614-branch to illustrate that the model based on the per-unit value form can obtain satisfactory optimization results and a significant reduction in time consumption
A Gaussian Mixture Model-Based Continuous Boundary Detection for 3D Sensor Networks
This paper proposes a high precision Gaussian Mixture Model-based novel Boundary Detection 3D (BD3D) scheme with reasonable implementation cost for 3D cases by selecting a minimum number of Boundary sensor Nodes (BNs) in continuous moving objects. It shows apparent advantages in that two classes of boundary and non-boundary sensor nodes can be efficiently classified using the model selection techniques for finite mixture models; furthermore, the set of sensor readings within each sensor node’s spatial neighbors is formulated using a Gaussian Mixture Model; different from DECOMO [1] and COBOM [2], we also formatted a BN Array with an additional own sensor reading to benefit selecting Event BNs (EBNs) and non-EBNs from the observations of BNs. In particular, we propose a Thick Section Model (TSM) to solve the problem of transition between 2D and 3D. It is verified by simulations that the BD3D 2D model outperforms DECOMO and COBOM in terms of average residual energy and the number of BNs selected, while the BD3D 3D model demonstrates sound performance even for sensor networks with low densities especially when the value of the sensor transmission range (r) is larger than the value of Section Thickness (d) in TSM. We have also rigorously proved its correctness for continuous geometric domains and full robustness for sensor networks over 3D terrains
Construction of Durable Self-Cleaning PDMS Film on Polyester Fabric Surface
The superhydrophobic surface can be prepared by two methods; one is by reducing the surface energy, and the other is by constructing a micro-nano rough structure. To achieve high superhydrophobic performance in terms of durability, the firm combination of hydrophobic coating and substrate is particularly important. Here, we use polydimethylsiloxane (PDMS) as a low surface energy monomer, water-borne polyurethane (WPU) as a dispersing aid, and use high-power ultrasound to disperse PDMS in water to make emulsion. The polyester matrix is etched by atmospheric plasma, dipped in PDMS emulsion, dried, and finally baked to induce PDMS on the surface of polyester fiber to cross-link into film. A series of tests on the self-cleaning polyester fabric prepared by this method show that when the concentration of PDMS is 8 g/L and the mass ratio of PDMS to WPU is 20:1, the water contact angle (WCA) reaches the maximum value of 148.2°, which decreases to 141.5° after 200 times of washing and 138.6° after 5000 times of rubbing. Before and after PDMS coating, the tensile strength of polyester fabric increases from 489.4 N to 536.4 N, and the water vapor transmission decreases from 13,535.7 g/(m2·d) to 12,224.3 g/(m2·d). This research is helpful to the large-scale production of self-cleaning polyester fabric. In the future, on the basis of this research, we will add functional powder to endow self-cleaning polyester fabric with higher hydrophobicity and other properties
Possible Role of Mitochondrial Transfer RNA Gene 5816 A > G Genetic Polymorphism (m.5816A > G) in a 3-Year-Old Child with Dystonia: Report of a Case
Background Mutations in the mitochondrial transfer RNA (mt-tRNA) gene are a hotspot for mitochondrial DNA (mtDNA) mutations and are most common in mitochondrial diseases
CPEB2 inhibit cell proliferation through upregulating p21 mRNA stability in glioma
Abstract Glioma is the most common primary malignant brain tumor in adults and remains an incurable disease at present. Thus, there is an urgent need for progress in finding novel molecular mechanisms that control the progression of glioma which could be used as therapeutic targets for glioma patients. The RNA binding protein cytoplasmic polyadenylate element-binding protein 2 (CPEB2) is involved in the pathogenesis of several tumors. However, the role of CPEB2 in glioma progression is unknown. In this study, the functional characterization of the role and molecular mechanism of CPEB2 in glioma were examined using a series of biological and cellular approaches in vitro and in vivo. Our work shows CPEB2 is significantly downregulated in various glioma patient cohorts. Functional characterization of CPEB2 by overexpression and knockdown revealed that it inhibits glioma cell proliferation and promotes apoptosis. CPEB2 exerts an anti-tumor effect by increasing p21 mRNA stability and inducing G1 cell cycle arrest in glioma. Overall, this work stands as the first report of CPEB2 downregulation and involvement in glioma pathogenesis, and identifies CPEB2 as an important tumor suppressor gene through targeting p21 in glioma, which revealed that CPEB2 may become a promising predictive biomarker for prognosis in glioma patients
Enzymatic preparation of immunomodulatory hydrolysates from defatted wheat germ ( Triticum Vulgare
Defatted wheat germ globulin (DWGG) was hydrolysed using the enzymes alcalase, neutrase, papain, pepsin or trypsin to improve the immunomodulatory effects of the protein. The degree of hydrolysis (DH), molecular weight distribution, hydrophobicity, secondary structures and immunomodulatory activities were determined. The DH of hydrolysate using alcalase or neutrase was higher (P < 0.05) than that of hydrolysate prepared by other proteases. Alcalase hydrolysate (AH) had the strongest (P < 0.05) immunomodulatory activity with respect to lymphocyte proliferation, phagocytosis of neutral red and secretion of pro-inflammatory cytokines. The molecular weight of AH ranged between 300 and 1450 Da and was composed of α-helix and β-turns. AH also showed the highest hydrophobic value (P < 0.05). The DH and hydrophobicity appear to be related to immunomodulatory activities. The hydrolysate prepared by the alcalase treatment on DWGG may be used as an immune supplement by the food industry
Amine Phase-Transfer Chemistry: A Green and Sustainable Approach to the Nonbiological Mineralization of CO<sub>2</sub>
An <i>amine phase-transfer approach</i> is a novel design
for the facile and recyclable fixation and nonbiological mineralization
of CO<sub>2</sub> into alkaline earth carbonate (MCO<sub>3</sub>,
M = Ca, Sr, and Ba) crystals with uniformed polymorphs at room temperature
under atmospheric pressure. The amines’ system based on two
phases of water and Zn-tetraphenylporphyrin (ZnTPP) in CH<sub>2</sub>Cl<sub>2</sub> provides a green and sustainable CO<sub>2</sub> capture
and utilization (CCU) strategy for the mitigation of anthropogenic
CO<sub>2</sub> emission to the atmosphere
Testing the unified bounds of quantum speed limit
Quantum speed limits (QSLs) impose fundamental constraints on the evolution
speed of quantum systems. Traditionally, the Mandelstam-Tamm (MT) and
Margolus-Levitin (ML) bounds have been widely employed, relying on the standard
deviation and mean of energy distribution to define the QSLs. However, these
universal bounds only offer loose restrictions on the quantum evolution. Here
we introduce the generalized ML bounds, which prove to be more stringent in
constraining dynamic evolution, by utilizing moments of energy spectra of
arbitrary orders, even noninteger orders. To validate our findings, we conduct
experiments in a superconducting circuit, where we have the capability to
prepare a wide range of quantum photonic states and rigorously test these
bounds by measuring the evolution of the system and its photon statistics using
quantum state tomography. While, in general, the MT bound is effective for
short-time evolution, we identify specific parameter regimes where either the
MT or the generalized ML bounds suffice to constrain the entire evolution. Our
findings not only establish new criteria for estimating QSLs but also
substantially enhance our comprehension of the dynamic evolution of quantum
systems
Table_1_Covert dissemination of pLVPK-like virulence plasmid in ST29-K54 Klebsiella pneumoniae: emergence of low virulence phenotype strains.docx
This study aimed to explore the epidemic, clinical characteristics, and molecular and virulence attributes of Klebsiella pneumoniae serotype K54 (K54-Kp). A retrospective study was conducted on 328 strains of Klebsiella pneumoniae screened in a Chinese hospital from January 2016 to December 2019. The virulence genes and antibiotic resistance genes (ARGs) were detected by PCR, and a drug sensitivity test was adopted to detect drug resistance. Multilocus sequence typing (MLST) and PFGE were performed to determine the clonal correlation between isolates. Biofilm formation assay, serum complement-mediated killing, and Galleria mellonella infection were used to characterize the virulence potential. Our results showed that thirty strains of K54-Kp were screened from 328 strains of bacteria, with an annual detection rate of 2.29%. K54-Kp had a high resistance rate to antibiotics commonly used in the clinic, and patients with hepatobiliary diseases were prone to K54-Kp infection. MLST typing showed 10 sequence typing, mainly ST29 (11/30), which concentrated in the B2 cluster. K54-Kp primarily carried virulence genes of aerobactin, silS, allS, wcaG, wabG, and mrkD, among which the terW gene was closely related to ST29 (p<0.05). The strains infected by the bloodstream had strong biofilm formation ability (p<0.05). Most strains were sensitive to serum. Still, the virulence of pLVPK-like virulence plasmid in ST29-K54 Klebsiella pneumoniae was lower than that of ST11 type and NTUH-K2044 in the Galleria mellonella model. Therefore, these findings supply a foundation to roundly comprehend K54-Kp, and clinicians should strengthen supervision and attention.</p