Temperature-sensitive Characteristics Research Articles

Methane Production Is More Sensitive to Temperature Increase than Aerobic and Anaerobic Methane Oxidation in Chinese Paddy Soils.

Methane emissions from paddy fields can increase under future warming scenarios. Nevertheless, a comprehensive comparison of the temperature sensitivity of methane-related microbial processes remains elusive. Here, we revealed that the temperature sensitivity of methane production (activation energy (Ea) = 0.94 eV; 95% confidence interval (CI), 0.78-1.10 eV) and aerobic (Ea = 0.49 eV; 95% CI, 0.34-0.65 eV) and anaerobic (Ea = 0.46 eV; 95% CI, 0.30-0.62 eV) methane oxidation exhibited notable spatial heterogeneity across 12 Chinese paddy fields spanning 35° longitude and 18° latitude. In addition, the Ea values of aerobic and anaerobic methane oxidation were significantly positively and negatively correlated to the latitude, respectively, while there was no significant correlation between the Ea of methane production and the latitude. Overall, there were no soil factors that had a significant effect on the Ea of methane production. The Ea of aerobic methane oxidation was primarily influenced by the contents of ammonium and clay, whereas the Ea of anaerobic methane oxidation was mainly influenced by the conductivity. Despite the variation, the overall temperature sensitivity of methane production was significantly higher than that of oxidation at a continental scale; therefore, an increase in the emission of methane from paddy fields will be predicted under future warming. Taken together, our study revealed the characteristics of temperature sensitivity of methane production and aerobic and anaerobic methane oxidation simultaneously in Chinese paddy fields, highlighting the potential roles of soil factors in influencing temperature sensitivity.

Design of hybrid multi-crosslinked hydrogel with a combination of high stiffness, elastic applied in high temperature and high salinity reservoirs

The mechanical strength of conventional hydrogels is inadequate for preventing leakage in high-temperature and high-salinity reservoirs, primarily due to the increased mobility of polymer chains and the degradation of crosslinked networks. Herein, we employed the strategy of ’network nesting and layer reinforcement’ to design a hybrid multi-site crosslinked hydrogel. This approach enhances the interconnections between polymer chains and fortifies the crosslinked network. The shear rheological behavior and temperature sensitive characteristics of the profile control working fluids were evaluated based on rheological dynamics. In the high temperature (140 ℃) and high salinity (21.81 × 104 mg/L) preparation environment, the effects of different components to the mechanical strength of the hydrogel were investigated under dynamic shear and uniaxial compression conditions. The incorporation of N-(hydroxymethyl)acrylamide (NMA) in the copolymerization with acrylamide (AM) resulted in an increase in the covalent cross-linking density, leading to a rise in the shear elastic modulus from 105 Pa to 238 Pa. The use of pre-gelatinized cassava starch (PGCM) as the grafting framework enhanced the bonding between the polymer chains, as evidenced by the increase in uniaxial compressive strength from 0.018 MPa to 0.081 MPa and the rise in peak strain from 55.0 % to 72.9 %. Furthermore, the synergistic effect of fumed silica (AEROSIL), which exploits mechanical coupling between inorganic nano-fillers and organic polymers, increased the compressive strength from 0.081 MPa to 0.418 MPa and raised the peak strain from 72.9 % to 81.8 %. It provides an effective approach to enhance the plugging performance of hydrogels in high temperature and high salinity reservoirs.

Preparation and chromatographic evaluation of hydrophilic polymer brushes grafted-silica with post modification of silicon/carbon dots as a green liquid chromatography stationary phase.

Polar stationary phases were prepared by grafting hydrophilic acrylamide (Am) polymer brushes with post modification of carbon dots (CDs) and silicon dots (SiDs) onto SiO2 particles. The prepared stationary phases, SiO2-PAm-CDs, SiO2-PAm-CDs/SiDs, and SiO2-PAm-SiDs, were packed as chromatographic columns, respectively. Using nucleic bases, organic acids, and β-agonists as targetsubstances to investigate the influence of chromatographic conditions on retentionand separation, the packed columns showed the partitioning and adsorption of mixed retention behavior in hydrophilic interaction liquid chromatography mode and successfully separated thepolar compounds. Most importantly, under per aqueous liquid chromatography mode (using 100% water as mobile phase), those columns still had goodseparation ability toward nucleic bases, β-agonist, and organic acids. Because AM isa temperature-sensitive monomer, the resulting van't Hoff curves exhibited a nonlinear relationship, having temperature-responsive chromatographic characteristic under pure water separation. Hence, building on temperature-sensitive characteristics and pure water of separation conditions, the separation selectivity toward hydrophilic compounds greatly improved. Compared with the commercial hydrophilic columns, the efficiency of our developed column had the superior ability in separation and detection of betaine in Goji berry with the enhanced resolution achieved in the proposedgreen separation method(just using pure water as mobile phase).

Adaptive state-of-health temperature sensitivity characteristics for durability improvement of PEM fuel cells

To obtain the temperature sensitivity characteristics of the proton exchange membrane fuel cell under different degradation levels, accelerated durability tests and temperature sensitivity tests of the fuel cell are first performed, and the temperature characteristics under different degradation states are analyzed by electrochemical impedance spectroscopy and polarization curve. Besides, an adaptive state-of-health transient thermal model of fuel cells is developed to investigate the effect of operating temperature on the internal gas concentration and hydrothermal distribution characteristics of the fuel cell from a mechanistic perspective. The experimental results of temperature sensitivity validate that the adaptive state-of-health transient thermal model can effectively monitor the steady and transient performance of the fuel cell. Subsequently, a mathematical model is proposed to describe the relationship among the load current, state of health, and optimal temperature using the temperature sensitivity test data and the transient thermal model of the adaptive state of health, which provides important insights into the optimal temperature range tailored to the current state of health of fuel cells to ensure efficient and stable operation of fuel cells all the time and contributes to the fine design of an optimal degradation adaptive temperature control strategy.

A silicon resonant pressure sensor based on thermal stresses matched structures

This paper introduced a silicon resonant pressure sensor based on thermal stress-matched structures to extend the operating temperature range. The sensor designed this time consists of an SOI wafer with a pressure-sensitive diaphragm for pressure sensing and two integrated resonators, a silicon wafer for vacuum packaging, and a glass wafer for additional stress isolation. The multilayer structures were bonded together to form a thermal stress-matched part to address the problem of temperature inflection points of conventional resonant pressure sensors within broad temperature zones. Finite element analyses optimized the sensor’s pressure- and temperature-sensitive characteristics. Micromachining based on eutectic and anodic bonding to fabricate sensor chips. Characterization results indicated the developed pressure sensor can work stably in a wide temperature range of -55∼125°C and has excellent fitting accuracy exceeding ±0.01% FS., which showed a better performance than previously reported counterparts.

Optimized properties of live vaccine influenza reassortant strains obtained by reverse genetics

Classical reassortment in developing chicken eggs is a well-established technique for obtaining LAIV strains. Naturally generated reassortant vaccine strains are characterized by high reproductive capacity, genetically stable characteristics of temperature sensitivity and cold resistance, which correspond to the characteristics of the MDV involved in crossing with the epidemic virus. Along with antigenic relevance, natural reassortment ensures attenuation of vaccine strains, good reproduction capacity in upper respiratory tract cells and inability to reproduction in the lower respiratory tract. With classical reassortment, the speed and efficiency of obtaining vaccine reassortants largely depend on the properties of epidemic virus, and therefore cannot be stable. The potential of reverse genetics is attractive because it allows to obtain vaccine reassortants quickly and efficiently, reduce the likelihood of spontaneous mutations; however, the vaccine strain is deprived of the advantages of natural selection, in which the most viable clones are selected. This study presents the results of comparatively assessed A(H3N2) LAIVs obtained in parallel by classical reassortment and reverse genetics according to criteria confirming that vaccine strains inherit the necessary properties that guarantee their harmlessness and high reproduction in chicken embryos. Strains for LAIV obtained by both methods retained all attenuating mutations inherited from the MDV, were highly reproductive at the optimal temperature, with temperature sensitivity corresponded to the MDV. However, strains obtained by reverse genetics, was observed to have partial loss of cold resistance in comparison with that of the MDV and classical reassortants. Reduced cold adaptation may negatively affect vaccine effectiveness. It is important that after several additional passages in chicken embryos at low temperature, the cold resistance of the vaccine strain, assembled by reverse genetics, was increased. Credibly that cold resistance is a phenotypic trait, the degree of manifestation of which depends on the temperature conditions of virus multiplication. The selective factor of reduced incubation temperature is missing in reverse genetics. In order for the cold-adapted phenotype to be fully realized, additional passages at low temperature of RG-reassortants are necessary. Thus, the reverse genetics method using plasmid technology allows to effectively prepare reassortant strains for LAIV. An important stage in obtaining vaccine strains using genetic engineering techniques should be the control of their cold-adapted phenotype and its optimization by additional passages at low temperature.

Bioinspired Confined Assembly of Cellulosic Cholesteric Liquid Crystal Bubbles.

Construction of biomimetic models for structural color evolution not only gives new photonic phenomena but also provide cues for biological morphogenesis. Here, a novel confined self-assembly method is proposed for the generation of hydroxypropyl cellulose (HPC)-based cholesteric liquid crystals (CLCs) microbubbles. The assembly process relies on the combination of droplet microfluidics, solvent extraction, and a volume confined environment. The as-prepared HPC structural color microbubbles have a transparent shell, an orderly arranged cholesteric liquid crystal (CLC)middle layer, and an innermost bubble core. The size of the microbubble, shell thickness, and the color of the CLC layer can be adjusted by altering the microfluidic parameters. Intriguingly, benefited from the compartmentalization effect provided by droplet microfluidics, microbubbles with multiple cores of different color combinations are generated under precise control. The self-assembled CLCs microbubbles have bright structural color, suspending ability, and good temperature-sensitive characteristics, making them ideal underwater sensors. The present confined assembly approach will shed light on creating novel photonic structures and the HPC microbubble will find widespread applications in multifunctional sensing, optical display, and other related fields are believed.

Steady-State Temperature-Sensitive Electrical Parameters’ Characteristics of GaN HEMT Power Devices

Gallium nitride high-electron-mobility transistor (GaN HEMT) power devices are favored in various scenarios due to their high-power density and efficiency. However, with the significant increase in the heat flux density, the junction temperature of GaN HEMT has become a crucial factor in device reliability. Since the junction temperature monitoring technology for GaN HEMT based on temperature-sensitive electrical parameters (TSEPs) is still in the exploratory stage, the TSEPs’ characteristics of GaN HEMT have not been definitively established. In this paper, for the common steady-state TSEPs of GaN HEMT, the variation rules of the saturation voltage with low current injection, threshold voltage, and body-like diode voltage drop with temperature are investigated. The influences on the three TSEPs’ characteristics are considered, and their stability is discussed. Through experimental comparison, it is found that the saturation voltage with low current injection retains favorable temperature-sensitive characteristics, which has potential application value in junction temperature measurement. However, the threshold voltage as a TSEP for certain GaN HEMT is not ideal in terms of linearity and stability.

High-sensitivity humidity and temperature sensor by cascading a polyimide coated long period fiber grating and a polydimethylsiloxane wrapped Mach-Zehnder interferometer.

Two different structures, long period fiber grating (LPFG) and a Mach-Zehnder interferometer (MZI), were cascaded to fabricate a sensor for sensing humidity and temperature simultaneously. Due to the humidity sensitive characteristic of polyimide (PI) and the temperature sensitive characteristic of polydimethylsiloxane (PDMS), the LPFG was coated with PI and the MZI was wrapped in PDMS to improve the humidity and temperature sensitivities, respectively. Humidity and temperature experiments and the stability and repeatability of the proposed sensors were performed. The sensor shows humidity and temperature sensitivities of ∼164 pm/%RH and 183 pm/°C in the humidity and temperature increasing experiments, respectively. Combining increasing, decreasing, and repeatable experiments of temperature and humidity, the proposed sensor shows stable performance in humidity sensitivity of ∼159 pm/%RH and temperature sensitivity of ∼175 pm/°C, with good linearity of ∼0.994. The structure of the proposed sensor has the advantages of low implementation cost, easy fabrication, and good stability.

Orange persistent luminescence of LuBaZn3GaO7: Bi3+ phosphor based on defect induction for optical thermometer and multi-mode anti-counterfeiting

In this study, the Bi3+ doped LuBaZn3GaO7 fluorescent powder was produced using a high-temperature solid-state technique, and its long afterglow luminescence and dynamic anti-counterfeiting capabilities were thoroughly examined. Under the ultraviolet (UV) light excitation, the LuBaZn3GaO7 host exhibits broadband self-activated emission band peak at 594 nm, attributed to the O-vacancies. Upon Bi3+ doping, the phosphor produces a narrow emission band in the 350–450 nm wavelength range, which is caused by the 3P1–1S0 transition of the Bi3+ ions in the Ba2+ site. Remarkably, oxygen vacancy-induced electronic localization around the Bi3+ ions increases the emission intensity of LuBaZn3GaO7:0.01Bi3+ around ten times that of LuBaZn3GaO7 between 450 and 850 nm wavelength. With the variation in excitation light wavelength, the intensity of the two emission bands of LuBaZn3GaO7: Bi3+ changed accordingly, exhibiting multi-color luminescence. While the excitation was removed after 3-min irradiation, LuBaZn3GaO7: Bi3+ phosphors continued to emit for 10 min. Moreover, the phosphor emission has good temperature-sensitive characteristics based on the fluorescence intensity ratio (FIR) of the emission bands of Bi3+ ions and host. Hence, an optical thermometry with high-temperature sensitivity was constructed. Consequently, it can be concluded that fluorescent powder has the potential to be applied in the fields of fluorescence temperature measurement and anti-counterfeiting.

Design of a new clean and comfortable temperature-sensitive polyethylene-based copolymer textile

With the rapid development of science and technology, compared with traditional textiles, which provide basic functions such as shelter from the body and cold, intelligent textiles can create a more comfortable and safe environment for people, improve work efficiency and meet people’s demand for diversified functions. At present, polypropylene material has the characteristics of temperature sensitivity, washing resistance, friction resistance, good whiteness and softness, and is widely used in textile, clothing and other industries. In this paper, The temperature sensitivity of cross-linked cotton fabric was characterized by measuring and analyzing the equilibrium swelling ratio, wetting time and surface contact angle. The temperature at which polymer properties suddenly change is 35°C, and the initial wetting time of cross-linked cotton fabric is longer than that of original cotton fabric. When the temperature exceeds 150°C, it loses its temperature sensitivity, resulting in the cross-linked cotton fabric being insensitive to temperature. The most suitable polymer concentration is 1%–8%. According to the DSC curve of P(MEO2MA-co-EGMA360) in the range of 60°C–20°C, the glass transition temperature (Tg) was determined. There is an obvious endothermic peak on the DSC curve near −26°C, which indicates that the glass transition temperature of P(MEO2MA-co-EGMA360) is −26°C, and P (MEO2MA-EGMA360). It is in a viscous state at room temperature. The air permeability and moisture permeability of cross-linked cotton fabric can be adjusted by changing the temperature, and the wearing comfort of the fabric can be improved. The test results of fabric wearability show that after crosslinking reaction, the washing fastness and rubbing fastness of fabric are within acceptable range, while whiteness, softness and mechanical properties are not affected. Considering comprehensively, when the polymer concentration is 8%, the drying temperature is 130°C and the drying time is 2 min, the finished fabric has the best indexes. This is mainly due to the spontaneous “self-adjustment” of aggregation morphology between the hydrogen bonding between polymer and water molecules and the hydrophobic interaction between molecules themselves in order to maintain a delicate dynamic balance, thus reaching a new thermodynamic equilibrium state. When the temperature exceeds the transition temperature, the surface of P(MEO2MA-co-EGMA360) film changes from a dense film structure to a porous structure, so that the air and moisture permeability can be adjusted and the wearing comfort of the fabric can be improved.

Highly sensitive surface plasmon resonance temperature sensor based on a hollow core fiber multilayer structure.

A surface plasmon resonance (SPR) temperature sensor based on a hollow core fiber (HCF) is designed in this paper. The sensor is composed of a multi-mode fiber (MMF)-HCF-MMF structure, and the self-made HCF is deposited successively with a thin layer of Au film (50 nm in thickness), gold nanoparticles (10 nm in diameter) and polydimethylsiloxane (PDMS). A series of theoretical and experimental investiagtions are conducted, and the results are as follows: the proposed sensing structure only with Au film can effectively excite the SPR effect, with a sensitivity of (2200 ± 100) nm / RIU in the refractive index (RI) range of 1.3334-1.3811; after adding AuNPS, the sensitivity of the sensor is effectively improved, the sensitivity can be increased to (3100 ± 100) nm / RIU, and after the PDMS coating, temperature sensing can be realized due to its unique temperature-sensitive characteristics, a linear sensitivity of (-2.1 ± 0.1) nm / °C is realized in the temperature range of 25 °C to 100 °C. The sensor has the advantages of simple structure, wide application, large measurement range, high sensitivity, good stability and repeatability. Meanwhile, the internal air hole of HCF leaves a preparation channel for dual-parameter measurement. It has broad application prospect in medical treatment, environmental monitoring and manufacturing industry.

3D Printing of Collagen Nerve Scaffold with Multichannel Characteristics

Given the difficulty in preparing multichannel nerve scaffolds for peripheral nerve repair, a method of manufacturing multichannel collagen nerve scaffolds by multi-nozzle 3D printing technology was proposed. Gelatin material is used as the core melting material because of its temperature-sensitive characteristics. A collagen nerve scaffold with a multichannel structure was manufactured by temperature-rising removal after printing, and the scaffold with different collagen concentrations was analyzed and evaluated in terms of microtubule diameter and mechanical properties. The research results show that the mechanical properties of the scaffold are gradually enhanced with an increase in collagen concentration. When the concentration of collagen is between 5% and 6%, the quality of the microtubule is significantly improved compared with the 4% collagen scaffold. Combined with the distribution of microtubule diameter, a lower concentration of collagen will lead to the collapse and deformation of the print structure, while a higher concentration of collagen will lead to the existence of voids in the print structure. Considering the manufacturing process, microtubule diameter, and mechanical properties of collagen nerve scaffold, 5% collagen nerve scaffold is the best and is expected to meet the requirements of peripheral nerve regeneration.

Novel PEX1 mutations in fibroblasts from children with Zellweger spectrum disorders exhibit temperature sensitive characteristics

Zellweger spectrum disorders (ZSD) are rare autosomal recessive disorders caused by defects in peroxisome biogenesis factor (PEX; peroxin) genes leading to impaired transport of peroxisomal proteins with peroxisomal targeting signals (PTS). Four patients, including a pair of homozygotic twins, diagnosed as ZSD by genetic study with different clinical presentations and outcomes as well as various novel mutations are described here. A total of 3 novel mutations, including a nonsense, a frameshift, and a splicing mutation, in PEX1 from ZSD patients were identified and unequivocally confirmed that the p.Ile989Thr mutant PEX1 exhibited temperature-sensitive characteristics and is associated with milder ZSD. The nature of the p.Ile989Thr mutant exhibited different characteristics from that of the other previously identified temperature-sensitive p.Gly843Asp PEX1 mutant. Transcriptome profiles under nonpermissive vs. permissive conditions were explored to facilitate the understanding of p.Ile989Thr mutant PEX1. Further investigation of molecular mechanisms may help to clarify potential genetic causes that could modify the clinical presentation of ZSD.

Luminescence, optical and temperature sensitive characteristics of Tm3+ /Yb3+ doped fluoride phosphosilicate glass ceramics

Yb3+/Tm3+ doped fluoride phosphosilicate glass ceramics with Sr6Ca4(PO4)6F2 nanocrystals were prepared by the controlled crystallization method. The research results of up-conversion (UC) spectra showed that the optimal dopant concentration of Yb3+ and Tm3+ was 3.0 and 0.1 mol%, respectively. In the visible range, the transmissivity of the precursor glass (PG) was close to 90%, while that of glass ceramics was approximately 82%. And the luminescence intensity of glass ceramics was stronger than that of PG. The Rietveld XRD refinement results confirmed that Yb3+ and Tm3+ ions partially entered the Sr6Ca4(PO4)6F2 crystal to form the solid solution. The highest relative sensitivity (Sr-max) of glass ceramics based on thermally coupled energy levels (TCELs) was 2.77% K-1 (@298 K). In view of non-TCELs, the highest absolute sensitivity (Sa-max) of glass ceramics was 12.21% K-1 (@698 K). These findings demonstrate that the as-prepared glass ceramic can be expected to be suitable for optical temperature sensing applications.

Development of Pneumatic Force-Controlled Actuator for Automatic Robot Polishing Complex Curved Plexiglass Parts

Due to the temperature-sensitive characteristic of plexiglass materials, it is necessary to maintain a constant small contact force to avoid surface burn damage when polishing complex curved plexiglass parts. To handle the issue, in this paper a pneumatic force-controlled actuator was developed to keep the normal contact force between the polishing tool and the workpiece constant during the robotic polishing process. The force-controlled actuator is configured with a double-acting cylinder as the driving element, and two electrical proportional valves are used to control the output force by adjusting the pressure difference between the two air chambers of the cylinder. In this case, a small contact force can be exactly achieved, and the cylinder can always work within the optimal pressure range. In order to judge the stability of the system and reduce the commissioning time of the force-controlled actuator, a mathematical model of the force-controlled actuator is established. Meanwhile, for eliminating the influence of the gravity of the polishing tool on the contact force control, a gravity compensation algorithm is also given according to the roll-pitch-yaw (RPY) angle calculation method. Since there are some nonlinear factors in the operation of the force-controlled actuator, a fuzzy proportion-integral-derivative (PID) control strategy is adopted without steady-state errors. Finally, the polishing experiment of a complex curved plexiglass part was carried out by using the robot automatic polishing system. The experimental results show that the contact force control effect of the force-controlled actuator meets the processing requirements, and the curved plexiglass part has good surface quality and optical performance after polishing.

Temperature sensitivity characteristics of PEM fuel cell and output performance improvement based on optimal active temperature control

This paper investigates the influence of temperature on the polarization process of PEM fuel cell in detail, and the quantitative analysis of temperature sensitivity for the polarization process is performed based on the electrochemical impedance spectroscopy and the semi-empirical equivalent circuit model. Besides, in order to make the PEM fuel cell stack operates with the optimal working efficiency and the lowest degradation and fault rate, an active temperature tracking decoupling control approach based on coupling algorithm of feedforward control, Takagi-Sugeno fuzzy theory and model predictive control is proposed. To fully demonstrate the effectiveness and superiority of the proposed method, its control effect on the 85 kW commercial PEM fuel cell system is compared with traditional feedforward control, PID control and MPC control under different operation scenarios. The results prove that the proposed method have better robustness and dynamic performance under different working conditions. Besides, the proposed decoupling tracking control model can keep the temperature difference between the inlet and outlet of the stack within 6 °C under the dynamic current condition, which is more helpful to enhance the uniformity of the internal temperature of the PEM fuel cell stack.

Density functional theory analysis and novel green chemical mechanical polishing for potassium dihydrogen phosphate

Potassium dihydrogen phosphate (KDP) has recently emerged as a promising candidate for the frequency converter and giant laser. Despite the great efforts to process the ultra-smooth surface of KDP, it is still elusive to remove the flaws precisely, resulting in fatal defects, such as cracks, dissolved cave and embedded grits, inducing the low performance of devices. In this study, a novel green chemical mechanical polishing (CMP) was developed for KDP, consisting of silica, graphene oxide, ethylene glycol and triethanolamine. The CMP developed effectively avoids the defects to KDP. Graphene oxide in slurry promotes the formation of complexes on KDP, which is proved by X-ray photoelectron spectroscopy and infrared Fourier transformation. The experimental results are in good agreement with those of density functional theory calculations using successive O-P bonds. Using the novel CMP, surface roughness Ra of 0.66 nm is achieved with a scanning area of 70 × 50 µm2, and the thickness of damaged layer is 18.27 nm. To the best of our knowledge, this is the lowest surface roughness on KDP after CMP under such a large area of measurement. These findings provide a new pathway to fabricate sub-nanometer ultrasmooth surface of KDP with soft-brittle, deliquescent and temperature-sensitive characteristics.

Bi-level Energy Trading Model Incorporating Large-scale Biogas Plant and Demand Response Aggregator

Increasing intermittent renewable energy sources (RESs) intensifies the imbalance between demand and generation, entailing the diversification of the deployment of electrical energy storage systems (ESSs). A large-scale biogas plant (LBP) installed with heating devices and biogas energy storage (BES) usually exhibits a storage-like characteristic of accommodating an increasing penetration level of RES in rural areas, which is addressed in this paper. By utilizing the temperature-sensitive characteristic of anaerobic digestion that enables the LBP to exhibit a storage-like characteristic, this paper proposes a bi-level energy trading model incorporating LBP and demand response aggregator (DRA) simultaneously. In this model, social welfare is maximized at the upper level while the profit of DRA is maximized at the lower level. Compared with cases only with DRA, the results show that the proposed model with the LBP improves the on-site accommodation capacity of photovoltaic (PV) generation up to 6.3%, 18.1%, and 18.9% at 30%, 40%, and 50% PV penetration levels, respectively, with a better economic performance. This nonlinear bi-level problem is finally recast by a single-level mathematical program with equilibrium constraints (MPEC) using Karush-Kuhn-Tucker (KKT) conditions and solved by the Cplex solver. The effectiveness of the proposed model is validated using a 33-bus test system and a sensitivity analysis is provided for analyzing what parameter influences the accommodation capacity most.

Luminescence and temperature-dependent sensitivity of Yb3+/Er3+ doped glass ceramics containing NaGd(MoO4)2 nanocrystals

Yb3+/Er3+ doped NaGd(MoO4)2 glass ceramics (GCs) were manufactured by melting quenching and subsequent controllable crystallization method, and the structure, transmissivity, up-conversion luminescence and temperature sensitive characteristics were studied. The results show that NaGd(MoO4)2 nanocrystals are embedded in the precursor glass (PG). The crystallization temperature and soaking time directly affect the crystallinity of the glass. Enhanced up-conversion luminescence in the GC sample is clearly observed. According to thermal coupling emission states, the maximum relative sensitivity (Sr-max) of 1.32 % K−1 and absolute sensitivity (Sa-max) of 1.90 % K−1 between 297 K and 437 K are acquired in the GC700-2h sample. This finding reveals that the obtained GC materials have great potential in optical temperature measurement.