Search

Saxifraga Tourn. ex L. is rich in species diversity with about 440-500 species and broad distribution. The taxonomical issues of this genus have been continuously concerned by the botanists. Saxifraga has important ornamental and medicinal values. Some of European countries have made great efforts on the exploitation and utilization of its ornamental resources. China is one of the diversity centers of Saxifraga, but it has been lagged far behind Europe, USA and even Japan in exploitation and utilization on ornamental value of this genus. The world breeding work in Saxifraga started 150 years ago. By the end of 2022, the 1 692 names of cultivars had been on-line listed by The Saxifrage Society, but only one came from China. In this paper, the germplasm resources of Saxifraga, and progress on its classification and breeding are reviewed, and also the utilization of its ornamental resources is briefly introduced, which will provide an important reference for taxonomical research, breeding and application of this genus in China. The results are as follows: (1) Saxifraga is rich in germplasms, but many scientific issues remain in the evolutionary relationships of its subordinate systems, which require a systematic and in-depth investigation by integrating morphological and molecular biology methods. (2) The cultivars of this genus are mainly raised through cross-breeding and mutant selection, and the majority of cultivars are from the UK, Czech Republic, Germany, and the Netherlands. (3) The breeding of Saxifraga started very late in China, with only few cultivars from one breeding method.

In this article, we investigate the relationships between the instantaneous invariants of a one-parameter spatial movement and the local invariants of the axodes. Specifically, we provide new proofs for the Euler-Savary and Disteli formulas using the E. Study map in spatial kinematics, showcasing its elegance and efficiency. In addition, we introduce two line congruences and thoroughly analyze their spatial equivalence. Our findings contribute to a deeper understanding of the interplay between spatial movements and axodes, with potential applications in fields such as robotics and mechanical engineering.

The prime objective of the approach is to give geometric classifications of kk-almost Ricci solitons associated with paracontact manifolds. Let M2n+1(φ,ξ,η,g){M}^{2n+1}\left(\varphi ,\xi ,\eta ,g) be a paracontact metric manifold, and if a KK-paracontact metric gg represents a kk-almost Ricci soliton (g,V,k,λ)\left(g,V,k,\lambda ) and the potential vector field VV is Jacobi field along the Reeb vector field ξ\xi , then either k=λ−2nk=\lambda -2n, or gg is a kk-Ricci soliton. Next, we consider KK-paracontact manifold as a kk-almost Ricci soliton with the potential vector field VV is infinitesimal paracontact transformation or collinear with ξ\xi . We have proved that if a paracontact metric as a kk-almost Ricci soliton associated with the non-zero potential vector field VV is collinear with ξ\xi and the Ricci operator QQ commutes with paracontact structure φ\varphi , then it is Einstein of constant scalar curvature equals to −2n(2n+1)-2n\left(2n+1). Finally, we have deduced that a para-Sasakian manifold admitting a gradient kk-almost Ricci soliton is Einstein of constant scalar curvature equals to −2n(2n+1)-2n\left(2n+1).

Objective To investigate the effect of psychological intervention combined with five-tone music therapy on relieving anxiety and depression of patients undergoing colonoscopy. Methods Totally 100 patients undergoing colonoscopy were randomly divided into the control group and observation group, with 50 cases in each group. All patients received routine care during the diagnostic colonoscopy, and those in the observation group were given psychological intervention combined with five-tone music therapy. The Self-rating Anxiety Scale and Self-rating Depression Scale were used to measure the emotional status of patients, and self-made questionnaire was used to evaluate the patient satisfaction with nursing service. Results Scores of SAS and SDS in the observation group was lower than those in the control group after colonoscopy(P＜0. 05). The satisfaction rate in the observation group was higher than that in the control group (96. 00% vs. 84. 00%, P＜0. 05). Conclusion Patients undergoing colonoscopy are more vulnerable to anxiety and depression. The psychological intervention combined with five-tone music therapy is potentially effective to relieve the anxiety and depression status of patients, and improve their satisfaction with nursing service. (目的 探讨心理护理干预联合五音疗法对结肠镜检查患者焦虑、抑郁情绪的影响。方法 选取2021年6月—12月来院接受结肠镜检查的100例患者为研究对象, 随机分为对照组和观察组。对照组给予常规护理, 观察组在常规护理的基础上给予心理护理及五音疗法。对比结肠镜检查前后两组患者焦虑自评量表(SAS)评分和抑郁自评量表(SDS)评分, 评价患者满意度。结果 肠镜检查后, 观察组SAS评分及SDS评分均低于对照组, 差异有统计学意义(P＜0. 05); 观察组满意度96. 00%(48/50), 高于对照组的84. 00%(32/50), 差异有统计学意义(P＜0. 05)。结论 患者在接受肠镜前存在焦虑、抑郁心理状态, 将心理护理及五音疗法应用于结肠镜检查过程, 可有效改善患者的焦虑、抑郁情况, 提高患者对护理的满意程度。)

Control rod hydraulic drive system (CRHDS) is the key power control equipment of 200 MW Nuclear Heating Reactor (NHR-200), and the capacitance rod position measurement sensor (CRPMS) is the key measurement equipment of CRHDS. For the measurement error caused by the eccentricity of the measuring rod, a new measurement method which can separate the capacitance variation caused by the stepping and eccentricity of the measuring rod was proposed (eccentricity-stepping separation method). Based on this method, a design of four-helix electrodes CRPMS was proposed. For the sensor, the theoretical model was established by finite element method, and the static characteristic experiment was carried out. The calculation results of the theoretical model are in good agreement with the experimental results. Based on the theoretical model, the function between capacitance values and rod positions was established, and the measurement error of the sensor was systematically analyzed. The structure optimization of the sensor was conducted. The results show that for the four-helix electrodes CRPMS with eccentricity-stepping separation method, the maximum measurement error is -3.11 mm under the calculation conditions, which can meet the requirements of rod position measurement without losing step. The results provide guidance for the improvement of CRPMS.

We prove that if an η\eta -Einstein para-Kenmotsu manifold admits a conformal η\eta -Ricci soliton then it is Einstein. Next, we proved that a para-Kenmotsu metric as a conformal η\eta -Ricci soliton is Einstein if its potential vector field VV is infinitesimal paracontact transformation or collinear with the Reeb vector field. Furthermore, we prove that if a para-Kenmotsu manifold admits a gradient conformal η\eta -Ricci almost soliton and the Reeb vector field leaves the scalar curvature invariant then it is Einstein. We also construct an example of para-Kenmotsu manifold that admits conformal η\eta -Ricci soliton and satisfy our results. We also have studied conformal η\eta -Ricci soliton in three-dimensional para-cosymplectic manifolds.

[Purpose/significance] An essential part of special collections department’s work is to routinely update metadata that is unique to special collections: Paper, Printing, Genre, Binding and Provenance Evidence, etc. Librarians can frequently encounter books with an only vague recording of its history before collected into the repository in university libraries. [Method/process] This paper introduced the case of collecting, analyzing and utilizing the stamp and signature information of single volume and books in Fudan University Library. In addition, the data mining was carried out for the stamp and signature without records. [Result/conclusion] Throughsmall sample tests, the researcher has proved the attempt successful using sample data. The basic designing of the database and work process is also illustrated.

To improve the transceiver quality of Free Space Optical (FSO) system and ensure that user access is feasible the network, a high-speed full-duplex 100 meters FSO transmission scheme using 67% duty cycle RZ-4PAM downlink and alternative mark inversion (AMI) uplink signals is designed system. In the downlink, one PAM sequence generator and one Mary pulse generator (MPG) module are used to generate 67% RZ-4PAM optical signals at 10Gbit/s through a Mach-Zehnder intensity modulator (MZM). The upstream AMI signals generator by the pseudo-random binary sequence (PRBS) generator and the precoding process. We have measured optical spectrums, time-domain waveforms and eye diagrams before and after signals transmission by system simulation. The transceiver performance of the downstream RZ-4PAM with 67% duty cycle and upstream AMI optical signals the in the 100m FSO transmission system is analyzed.

In order to solve the problem of network frequency resource congestion from the central office (CS) to the base station (BS) in sixth generation (6G) mobile communication systems, we design a passive optical network (PON) access scheme. 1.25Gbit/s non-return-to-zero (NRZ) downstream signals over 6GHz subcarrier are successfully transmitted in the 20km single-mode fiber (SMF) and allocated to 4 optical network units (ONUs). The radio frequency (RF) spectrums, optical spectrums, eye-diagrams and bit error rate (BER) before and after transmission of NRZ signals in the system were measured and analysed. The results show that, this scheme can provide high-speed, stable and secure data communication.

In order to improve the transmission performance of visible light communication (VLC) system and user’s demand for large-capacity and high-speed, one multi-color VLC scheme is proposed. This scheme uses red-green-blue light-emitting diode (RGB-LED) as the sender to transmit 4-ary pulse amplitude modulation (4PAM) signals with 67% return-to-zero (RZ). At the receiver, one optical bandpass filter is used for channel separation. By system simulation, we have measured the time-domain waveforms before and after transmission, eye diagrams of the three colors signals, and the bit error rate (BER) performance has been analyzed. The results show that at receiver power of -11dBm, the BER at back-to-back case is slightly lower than that of the signals transmitted in the 8m channel. Since 4PAM signals have higher spectral efficiency compared with the traditional binary signals, this scheme has potential application value in indoor broadband access system.

In this paper, the performance of a 60 GHz radio over fiber free space optics (RoF-FSO) communication system with 10Gbit/s 4-ary pulse amplitude modulation (4-PAM) polarization shift-keying (Polsk) downlink signal is proposed and designed. In the receiver, the 60GHz millimeter-wave with 4-PAM downstream signals is generated by the beating of two continuous light waves, and the high frequency signal is demodulated by self-mixing zero difference detection method. Meanwhile, the optical spectra, radio frequency (RF) spectrum, eye-diagram are measured, and the transmission performance of the used RoF-FSO system are analyzed.

This study is mainly designed to evaluate a popular learning method: previewing material before classes and to answer two research questions on the learning method. The research questions are "Does previewing have benefits in promoting future learning?" and "Do people have correct metacognitive judgements on the effects of previewing?" The hypothesis states that previewing is beneficial in ways other than directly pre-stating answers (e.g., providing context information or keywords) and that, in general, individuals' judgements on the effects of previewing are correct. This experiment found that participants who read preview materials before watching a brief lecture do not perform significantly better on post-tests than participants who have not read the preview. At the same time, most people who read preview materials see the preview as beneficial to their understanding of the topic, which is an incorrect metacognitive judgement. This study indicates that the importance of preview for learning performance may be a myth and reveals how people misjudge the benefits of previewing. These findings can lead to an improved understanding of better ways to conduct self-cognitive study.