Based on GSM /CDMA network,the security door described in this paper is controlled by SMS.Making use of seamless coverage of the GSM /CDMA network,the security door and the like can be controlled and unlocked everywhere from a distance or remotely.The system could extend to the function of alarm,which is the ideal guard against theft in our modern life.
We here disclose two triarylborane-based [7]helicenes, which contain a dimesitylboryl or a 2-(dimesitylboryl)phenyl at position 9 of the [7]helicene skeleton. The change in the peripheral substituent from dimesitylboryl to 2-(dimesitylboryl)phenyl induced doubling of |glum| and sign inversion of the circularly polarized luminescence (CPL). The substituent dependence of the CPL sign is reasonably explained by the propeller configuration flipping of boron, which has a significant influence on the chiroptical properties.
Twenty-six total intravenous anesthesia was performed in 23 ASAⅡorⅢpatients with various advanced malignancies undergoing whole body hyperthermia (WBH). Their age ranged from 32 to 67 yrs and body weight between 42 and 77 kg. The patients had no hypertension, coronary artery disease or diabetes mellitus. Anesthesia was induced with midazolam 5-10 mg, fentanyl 0.1 mg, propofol 1.5-2.5 mg·kg-1 and vecuronium 0.12 mg·kg-1 and maintained withⅣinfusion of midazolam (0.08-0.16 mg·kg-1·h-1), remifentanil (0.05-0.15μg·kg-1·h-1) and vecuronium (0.08-0.15 mg·kg-1·h-1). The patients were mechanically ventilated (VT = 8-12 ml·kg-1, RR= 10-18 bpm, FiO2 = 1.0) after tracheal intubation. PETCO2 was maintained at 35 mm Hg. ECG, MAP, HR, CVP, SpO2 , PETCO2 , peak airway pressure, VT, RR, minute ventilation (MV), urine output, core temperature (lower esophageal and naso-pharyngeal) and surface temperature were continuously monitored. Swan-Ganz catheter was placed in 15 patients. MPAP, PCWP and cardiac output (CO) were measured and Qs/Qt, cardiac index (CI) and stroke index (SI) were calculated. WBH was induced in an ultra-red radiation hyperthermic cabin (type ET-SpaceTM-1) and was divided into 3 phases:Ⅰwarming phase (lower esophageal temperature increased gradually to 41.8℃) ;Ⅱhyperthermic phase (lower esophageal temperature was maintained at 41.8℃for 1 h) andⅢcooling phase (core temperature was gradually decreased to 38.5℃without any cooling measures). Blood samples were taken from artery and Swan-Ganz catheter 15 min after induction of anesthesia (baseline), at 39℃, 40℃, 41℃and 41.8℃during warming phase, at the late hyperthermic phase and at 40℃and 38.5℃during cooling phase for blood gas analysis, determination of blood electrolytes and sugar. As the temperature was increasing, HR, CI, SI, CVP, MPAP, PCWP, Qs/Qt and peak airway pressure were gradually increased while MAP, PaO2 , pHa, BE and blood glucose and K+ were decreasing during warming phase (Ⅰ). These changes reached the peak levels at the late period of hyperthermic phase (Ⅱ) and then gradually returned to baseline during cooling phase (Ⅲ) . Vasoactive drugs and fluid infusion including crystalloid and colloid were needed to maintain hemodynamic stability in 69% patients. Acidosis had to be corrected in 54% patients. Severe hypotension and pulmonary edema occurred in 4 patients. Continuous hemodynamic monitoring, respiratory support, maintenance of circulatory stability and correction of acidosis and hypokalemia were the key factors in the management of patients during WBH.
2,4-Difluorophenylacetonitrile was synthesized from 2,4-difluorobenzaldehyde by reduction with KBH4 in water,followed by chlorination and cyanation in the water-carrying agent in one-pot.The effect of the different types of the reductant and water-carrying agent on the yield was investigated.The experimental result showed that the optimal condition was as follows:the molar ratio of 2,4-difluorobenzaldehyde,potassium borohydride,thionyl chloride and sodium cyanide was 1 ∶0.36 ∶1.26 ∶1.35,toluene was used as the water-carrying agent and the solvent of chlorination and cyanation,temperature of cyanation was 90 ℃,time was 3 h,the total yield was 62.1%.The improved synthetic process is practical and easy to be scaled up.
Wireless energy harvesting, scavenging energy from ambient radio signals, has been recently viewed as a promising solution to extend the operation time of the various mobile devices. In this paper, we use a contract approach to study the power allocation and pricing issue for the simultaneous wireless information and power transfer (SWIPT) in a downlink cellular network, where a monopoly mobile network operator (MNO) gains revenue from providing both information and energy transfer for its subscribers. Each user decides his optimal power splitting ratio to harvest energy as much as possible when the required data rate can be satisfied. Specifically, the MNO will design and offer a set of contract items in the form of transmit power and the corresponding price. Then each user will choose the best contract item based on his private information (user's type). Furthermore, we first derive the necessary and sufficient condition to make the contract feasible, i.e., satisfying incentive compatibility (IC) and individual rationality (IR) constraints, and then we derive the optimal and feasible contract that maximizes the MNO's profit. Finally, the numerical results show that the MNO tends to exclude some users from enjoying wireless power transfer service to maximize its profit. And when the energy harvesting efficiency increases, the MNO will include more users to enjoy the power transfer.
In 5G New Radio (NR) system, beamforming with large antenna array is utilized to compensate the high pathloss. However, the directionality of beam has a significant influence on the performance of co-existence. In this paper, the co-existence of downlink 5G NR homogeneous networks is investigated and analyzed in Urban Macro (UMA). Adjacent channel interference ratio (ACIR), as an important parameter of co-existence analysis, is explored to guarantee the performance of users, especially for the cell-edge users. Capacity loss is used to describe impact of co-existence. The results show the performance of co-existence and give the advice of the appropriate ACIR design. Besides, beam sensitivity and co-existence analysis in alternative array configurations are simulated as a comparison. The co-existence impact of different site deployment for NR systems is studied in the end.
The accurate evaluation of weak noncovalent interactions in large, that is those containing up to thousand atoms, molecular systems represents a difficult challenge for any quantum chemical method. Indeed, some approximations are often introduced to render affordable these calculations. Here, we consider the PBE-QIDH/DH-SVPD protocol, combining a nonempirical double hybrid functional (PBE-QIDH) with a small basis set (DH-SVPD) tailored for noncovalent interactions with a double aim: (i) explore the robustness and accuracy of this protocol with respect to other Density Functional Approximations; (ii) illustrate how its performances are affected by the computational parameters underlying the calculation of the exact exchange and the Coulomb contribution, as well as the perturbative term. To this end, we consider three data sets, namely S66, L7, and CiM13, incorporating molecules of increasing size. On the bright side, our results suggest that the PBE-QIDH/DH-SVPD protocol is particularly accurate for large systems such as those contained in the CiM13 set (up to more than 1000 atoms and 14 000 basis functions), for which the DLPNO approximation leads to a significant speed-up for the evaluation of the perturbative correlation term. However, our analysis also points out the limit of this statistical exercise, when the quality of the reference data cannot be easily assessed, due to the size of the molecular complexes involved, and when the number of molecules is limited.
The so-called protobranching phenomenon, that is the greater stability of branched alkanes with respect to their linear isomers, represents an interesting challenge for approaches based on density functional theory (DFT), since it requires a balanced description of several electronic effects, including (intramolecular) dispersion forces. Here, we investigate this problem using a protocol recently developed based on double-hybrid functionals and a small basis set, DH-SVPD, suited for noncovalent interactions. The energies of bond separation reactions (BSR), defined on the basis of an isodesmic principle, are taken as reference properties for the evaluation of 15 DFT approaches. The obtained results show that error lower than the so-called "chemical accuracy" (<1.0 kcal/mol) can be obtained by the proposed protocol on both relative reaction energies and enthalpies. These results are then verified on the standard BSR36 data set and support the proposition of our computational protocol, named DHthermo, where any DH functional, such as PBE-QIDH or B2PLYP, provides accurate results when coupled to an empirical dispersion correction and the DH-SVPD basis set. This protocol not only gives subchemical accuracy on the thermochemistry of alkanes but it is extremely easy to use with common quantum-chemistry codes.
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