Research on the Testing Methods of Instrumental System in the Marine Magnetic Survey

Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method brought out can effectively eliminate the systematic error caused by the instrumental system, and greatly improve the surveying precision and the reliability of the survey results.

The Jiao Tong University Spectroscopic Telescope Project

The Jiao Tong University Spectroscopic Telescope(JUST)is a 4.4-meter f/6.0 segmented-mirror telescope dedicated to spectroscopic observations.The JUST primary mirror is composed of 18 hexagonal segments,each with a diameter of 1.1 m.JUST provides two Nasmyth platforms for placing science instruments.One Nasmyth focus fits a field of view of 10′and the other has an extended field of view of 1.2°with correction optics.A tertiary mirror is used to switch between the two Nasmyth foci.JUST will be installed at a site at Lenghu in Qinghai Province,China,and will conduct spectroscopic observations with three types of instruments to explore the dark universe,trace the dynamic universe,and search for exoplanets:(1)a multi-fiber(2000 fibers)medium-resolution spectrometer(R=4000-5000)to spectroscopically map galaxies and large-scale structure;(2)an integral field unit(IFU)array of 500 optical fibers and/or a long-slit spectrograph dedicated to fast follow-ups of transient sources for multi-messenger astronomy;(3)a high-resolution spectrometer(R~100000)designed to identify Jupiter analogs and Earth-like planets,with the capability to characterize the atmospheres of hot exoplanets.

Optical system research of multi-object fiber spectroscopic survey telescope

In the first part of this paper,four different Cassegrain optical systems with their correctors are designed and studied for multi-object fiber slit spectroscopic survey.The aperture in 6.5 m and field of view 3°are taken for these optical systems.Assuming observation wavelength range is 0.365-0.95μm,the maximum zenith distance for observing is 60°,the maximum diameter of these lenses is 1.66 m,the altitude of the telescope site is 2500 m,two correctors are composed of 4-piece lenses and the other two are 5-piece lenses.The results obtained are:f-ratio about 3.7,the image quality for all four systems with EE80D≤0.60″,the linear diameter of the focal surface is about 1.2 m and 11 000 fibers can be set on it.Considering the limit of size of fused silica and optical glass,the maximum diameter for lens is about 1.7 m.Such a 6.5 m telescope is about the largest one if using the above correctors.Considering the multiobject spectroscopic survey is greatly important,we also studied some telescope optical systems having their aperture near or larger than 10 m used for the multi-object fiber spectroscopic survey.Such ideas are introduced in the last section of this paper.

Reliability and Validity of the Chinese Version of the Survey of Family Environment (SFE)

This study, in which 519 child-rearing families in Hong Kong participated, examined the reliability and validity of Chinese-language version of the Survey of Family Environment (SFE-C). The SFE-C is a self-administered questionnaire containing 30 items that examines family functioning and family support needs. It is designed to yield an instrument satisfaction score (SS score: family functioning score). Internal consistency was estimated at 0.92 (Cronbach’s alpha for SS scores). In a test-retest study of 33 families, the correlation coefficient for families’ mean SS score over a two-week period was 0.93, indicating high test-retest reliability. Confirmatory and exploratory factor analysis using the Concentric Sphere Family Environment Theory indicated that the SFE-C’s structure included seven factors, thereby supporting the SFE-C’s construct validity. The SFE-C demonstrates good reliability and validity and may be used to evaluate Chinese families’ functioning.

Instrumentation

Journal Scope:Instrumentation is a high quality open access peer reviewed research journal.Authors are solicited to contribute to these journals by submitting articles that illustrate most up-to-date research results,projects,surveying works and industrial experiences that describe significant advances in the instrumental science.The mission of the Instrumentation

Instrumentation

Journal Scope:Instrumentation is a high quality open access peer reviewed research journal.Authors are solicited to contribute to these journals by submitting articles that illustrate most up-to-date research results,projects,surveying works and industrial experiences that describe significant advances in the instrumental science.The mission of the Instrumentation is to provide a platform for the researchers,academicians,

Instrumentation

Journal Scope:Instrumentation is a high quality open access peer reviewed research journal.Authors are solicited to contribute to these journals by submitting articles that illustrate most up-to-date research results,projects,surveying works and industrial experiences that describe significant advances in the instrumental science.The mission of the Instrumentation

Two suggested configurations for the Chinese space telescope

China will establish a 2-meter space-based astronomical telescope. Its main science goals are performing a sky survey for research about dark matter and dark energy, and high resolution observations. Some experts suggest that this space telescope should be installed inside the Chinese space station. In accord with this suggestion we put forward our first configuration, i.e., to adopt a coude system for this telescope. This coude system comes from the Chinese 2.16 m telescope＇s coude system, which includes a relay mirror so that excellent image quality can be obtained. In our second configuration, we suggest that the whole space telescope fly freely as an independent satellite outside the space station. When it needs servicing, for example, changing in- struments, refilling refrigerant or propellant, etc., this space telescope can fly near or even dock with the core space station. Although some space stations have had accom- panying satellites, the one we propose is a space telescope that will be much larger than other accompanying satellites in terms of weight and volume. On the basis of the second configuration, we also put forward the following idea： the space station can be composed of several large independent modules if necessary.

Suggested quasi-Cassegrain system for multi-beam observation of FAST

FAST,the largest single-dish radio telescope in the world,has a 500-meter diameter main reflector and a 300-meter diameter illuminated area.It has a main reflector that can vary its shape,which continuously changes the shape of the illuminated area in reflector into a paraboloid.In this article,we propose a quasiCassegrain system for FAST.The detailed design results are provided.Such a quasi-Cassegrain system only needs to add a 14.6-meter diameter secondary reflector,which is close to the size of the feed cabin.The distance from the secondary reflector to the focus is only 5.08 m,and it has excellent image quality.In this quasi-Cassegrain system,the shape of the illuminated area in the main reflector continuously changes into an optimized hyperboloid.Using this quasi-Cassegrain system from frequency 0.5 GHz to 8 GHz,the multi-beam system can include 7 to 217 feeds.If this system is used in combination with Phased Array Feed(PAF)technology,more multi-beam feeds or a higher working frequency can be used.

Student Self-assessment for Undergraduate, Graduate and Imernational Finance Courses

Assessing student learning can be exceedingly challenging considering that as faculty we never really know what a student knows prior to entering our classroom and what value-added material has been assimilated during the academic quarter. This research paper introduces a self-assessment instrument that focuses on ten major finance topics and reports the results of the administration of the self-assessment tool for finance education at the undergraduate and graduate level in courses taught in the United States and abroad. Ten topics of importance to most finance curriculum design were selected as the focus topics. The research methodology employed uses a pre-/post- test comparison with ＂understanding＂ being measured on a five-point Lichert scale as implemented in five different fmanee courses. Significant measurable differences occurred in each of the courses using this finance assessment instrument with overall average improvement of understanding by the students as much as one entire point. For exarnple, 1.5 mean score for the pre-test and 2.4 mean score for the post -test for an introductory finance class at the undergraduate level in a college of business. Additional improvements were assessed in each of the courses surveyed.

Dual-band bandpass tunable microwave photonic filter based on stimulated Brillouin scattering

A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to generate two passbands by implementing phase modulation to amplitude modulation conversion by using SBS induced sideband amplification. The center frequencies of both passbands can be independently tuned ranging from 1 GHz to 19 GHz. High resolution with 3 d B bandwidth less than 30 MHz and large out-of-band rejection about 40 d B under 25 m W optical pump power are achieved.